He's asking about "how fast" one would do the reps in a set.

If that's what he means, then I suppose the tempo is something that you set up.

Want to do it the hard way? Do it as slow as possible, or as fast as possible. On HIIT it's always fast. High Intensity and all.

Want to do it your way? Do it according to your skills and capabilities. Don't go sprinting for 5 minutes if just 60 seconds leave you gasping.