How many pages does Calvin and hobbes lazy Sunday book have?

The "Calvin and Hobbes Lazy Sunday" book is actually a collection of comic strips from the overall series, not a standalone story with a set page count. The number of pages will vary depending on which edition you are looking at.

If you have a specific edition in mind, you could look on the back cover or inside for the page count.

If you are looking for information about the overall "Calvin and Hobbes" comic strip, it ran for 10 years (1985-1995) and was compiled into several collections. There are also numerous "Lazy Sunday" strips, but they are not collected as a single book.