Sentence examples for it's a lot from inspiring English sources

"it's a lot" is correct and can be used in written English.
It is often used to express a large amount or quantity of something. Here are some examples: - "I have to finish writing this report by tomorrow, it's a lot of work." - "I know you're busy, but can you help me carry these boxes? There's a lot of them." - "The concert tickets were expensive, but it's a lot cheaper than seeing them live in a big stadium." - "I can't eat all of this food, it's a lot for one person." - "I'm not sure I can handle all of these responsibilities, it's a lot to take on."