Have I got this right??

What you want to do is perfectly legal.

As you’re working 6 shifts don’t forget to check that there’s no more than six 24 hour periods (144 hours) between weekly rest periods.

The-Snowman:
Yes you can do that but remember the “lost” time needs to be made back.

He’s having 4 days off at the end of next week so the compensation will be paid back then.