Xjyuk

I thought the answer would be simple and maybe it is, but it's just rattling my brain.

If there was a planet 100 times the circumference of Earth, assuming everything is similar to Earth, 1 day (1 rotation) is 24 hours (therefore the planet will be spinning faster than Earth?) so I was wondering:

Would there still be 24 time zones, one for each hour? As the planet is just a sphere and the sun would just simply hit the areas it can see regardless of the larger size. So I'm assuming there would only 24 zones.

But trying to imagine someone getting up in China the same time someone gets up on the west coast of America is getting to me, but since the planet must be spinning faster to compensate, it should make sense?

You don't need to consider another planet, Earth is sufficient for this question.

The real problem is in thinking of time zones as a natural phenomenon. They aren't.

Take where I am right now. I'm located somewhat west of the center of my timezeone, so my clock is 20 minutes faster than a sun-based clock. And then there is daylight saving time, which adds another hour. Does it bother me (and others) that our clocks are "wrong" by an hour and twenty minutes? Not at all. Most people aren't even aware of the concept.

Take China as a larger example. By the sun, one end of the country is 4 hours different from the other end. But unlike other countries, China has only 1 official time zone, not 5. When some people get up and have breakfast their clocks will say 6:00, while for other people it will say 10:00. But in both cases, the sun has just risen. For some people "noon" is at 10:00, for others it is at 14:00. The official clock time doesn't match the sun's clock, but people get used to it.

And as for making a planet larger, it makes no difference. We can already see that situation here on Earth.

At the equator, 1-hour time zones are about 1000 miles across, but farther north, the lengths of the latitudes get smaller.

Iceland's time zone is only 440 miles across.

Even farther north, at Alert, Nunavut, Canada, the timezone is only 135 miles across.

Stand near the North Pole (or South Pole), and walk around it. You'll have to change your watch by an hour after each step.

Obviously time zones can become confusing and inconvenient when they are too small, but in such situations (remember, the zones are an entirely artificial human invention) it's common to designate the whole area as a single time zone (typically UTC) even though it spans many, or even all, actual time zones.

But in the OP situation, everything is larger, not smaller, so, except near the poles, time zones would be even less of a problem than they are on Earth.

I sense some confusion in your ideas, let's try to set things straight.

a planet 100 times the size of earth, assuming everything is similar to earth, 1 day (1 rotation) is 24 hours (therefore the planet will be spinning faster than earth?)

Setting aside the plausibility of such a planet, Earth does a complete rotation around itself in 24 hours. This planet does a complete rotation around itself in 24 hours. The rotational velocity is the same for both.

Would there still be 24 time zones, one for each hour?

In principle yes, but it can also be that, due to the larger linear distances between the zone extremes, half hour time zones can be used. Don't forget time zones are just a convention, in the past each city had its own time.

But trying to imagine someone getting up in China the same time someone gets up on the west coast of America is getting to me,

This is blatantly false: if you look at the official time zones on Earth,

You see that while China is +8 UTC, America west coast is -8 UTC. This means 16 hours difference.

If the planet rotates at the same rate as Earth, it'll have the same difference in sunrise, sunset, noon and midnight times for a given number of degrees of longitude, so will have the same "number of time zones" as Earth. These zones will naturally be much wider than those on Earth, but they'll work just the same way -- including needing a "date line" so you don't lose a day if you circumnavigate to the west (as Magellan's crew did).

However: The United States (prior to the annexation of Alaska and Hawaii in 1959) had four time zones for a width of around 3000 miles. If the United States were, instead, 300,000 miles wide, there might well be three hundred time zones. Why?

Time zones originally came from railroads. Before the 1860s, each town would set its clocks based on (usually) local noon, because it's easy to measure. But with railroads and telegraphs, it was necessary to know what time the train would arrive and depart -- which meant it was necessary, as well, to know what time it was in Tempe when you were leaving Kansas City. Having only four zones for the whole nation meant you could know that Tempe, Sheridan, and Butte had their clocks set the same -- and telegraphy made this actually practical, by allowing near-instantaneous transmission of time synchronizing signals.

But trains can only travel a few hundred miles in a day (at least with early steam technology), so there's no need to have time zones as coarse as 75,000 miles across -- there might well be "minute" zones, and they'd still be wider than the "hour" zones we have on Earth.

"Timezone" are all "subjective"! It was first created by Scottish-born Canadian Sir Sandford Fleming in 1876. It's all for us-human-being's convenience!

The very fact that the timezone lines on Earth are all crooked at many places prove it!

The Greenland lay across 5 timezones! But they don't like the idea and make the whole chunk of land under 1 timezone!

And if you across the sea from the Northwest coast to Quttinirpaaq National Park, you had "jumped" across "TWO" timezones!

And certain countries have "Daylight Saving Time"! Which means in the same timezone, the time is different in Summer and Winter time!

That further proved that "time and timezone" are all for "OUR" convenience!

So to come back to your question, you could have "as many timezones as you want"!

You can even divide the globe into "15-minute-timezones" if you so wish!

And that might be a better idea since your planet is SO~ big!