My cat is 8 years old has an outdoor indoor routine. He wears a collar so I know where he is. His schedule is out at 4 or 5 a.m. in at 8 or 9. You an go back to bed. In for the day until 3 or 4. Out again then in by around 8. Then hes in until the next day. I have an app that checks where he is. His routine is pretty regular. You ca do whatever you want whether hes in or out. Just keep track of time. Hes a sweetheart and loves company.