How do you manage on-call & interviewing?

For the engineers here, how do you manage on-call rotations and interviewing candidates as part of your role?

I honestly find on-call to be the worst part of my job, some weeks its very easy and I don't have to do anything, other weeks it's complete whiplash and long hours, day after day.

Interviewing also takes up a decent amount of time and can be hard to say no to frequently. How do you manage being an interviewer with multiple jobs?

FWIW, not currently over-employed but work very few actual hours and considering making the jump.