Do I use timeslot or time slot or time-slot? [closed]

According to dictionary.com, it should be two separate words "time slot".

This useful article on compound words offers the following advice:

Many of them are found in the dictionary and are not subject to our interpretation, our judgment, or our whim. Start with your dictionary before applying any other guidelines.

I would be inclined to follow that advice, and use the dictionary version: time slot.

It seems that time slot is currently most common, but that doesn’t prevent you from adhering to more (or less) traditional approaches.

Here is the google n-gram of the variants in use since 1940.

And it is always worth browsing at more venerable sources such as The New Yorker’s inimitable Comma Queen, Mary Norris, or, indeed, Wiktionary.