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A planet can be spinning like a toy top, or tidally locked to whatever it orbits, or anything in between. You might not like ardeegee's phrasing, but his explanation is dead on. Even fantasy needs to be internally consistent, by the way; if it isn't, that's not fantasy, it's daydreaming. Having a character say to his sidekick "As you know, our planet rotates slower than Earth because it's larger", aside from all the other things wrong with that sentence, is going to boot clueful readers right out of their immersion and probably into severe annoyance and possibly throwing things. This isn't the effect that you want.
If you're going to use any aspect of reality, you have to get it right. Readers expect the story they're reading to be consistent with reality anywhere they haven't been told it's not -- for example, if water routinely flows uphill, they shouldn't have it sprung on them as a surprise just in time to save the day -- and that includes basic physics. Will everyone know that a larger planet would have higher gravity? No ... but enough will to tell the others. People will know, and that won't be good for the story.
When you make any changes from the expected reality, you have to be certain that those changes are necessary. For example, is it actually necessary that your world be that large? Are there other ways you could get the effect you want without stretching your planet? Remember that in pre-industrial days, travel was slow. Is there some reason that isn't slow enough, or can't be used for some other reason? If you need more land area (remembering that there are uncontacted tribes even today), would just putting in more land work? Yes, that would change the weather dynamics, but unlike the enlarging of the planet, few people know or care exactly how, and that would be less intrusive on an fantasy novel in any event.
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