Is there a limit on how many conditional formatting rules I can have?

I'm about to embark on created hundreds & hundreds of conditional formatting rules for a big full year shift planner sheet I'm creating. It's a massive faff, and It'd be great if I could just select a range of cells like you can in Excel, instead of being limited to just one chosen column. But that's not going to change any time soon.

Is there hard limit on the number of rules I can have?