I don’t understand this.

I have Canada and USA coworkers and when they ask for time off approval, they usually get it according to a per team schedule.

We know what quarters are going to be the busiest before hand so everyone is encouraged to take time off when it is less demanding.

You can also take time off in busiest times.

In both cases, you are asked to request anyone from your team to backup you up (obviously available when you are not)