Generally, Cut. is split into roughly 4x 1hr sessions, 1x 20min HIIT session and 1x optional 1hr session of your choice per week (with 1x dedicated rest day per week).
Cut. will work best if followed as it’s designed, but we all get those times when we just don’t have time. Don’t feel bad if you need to take the optional rest day! I personally train 5 days a week because I can’t fit in any more training, so although it would be amazing to do that extra exercise of choice - it’s just not realistic for me.
If you can manage 4 sessions, the 4x 1hr sessions are the ones to go for and you’ll still find great results! Any less than that, and one way to use the programme might be to just spread the workouts out over a longer period of time, so you still do them in order but in a way that works for you!