Time Breaker

When a player is allowed multiple plays on their turn, are there any guidelines for timing between plays?

Officially, no...
...BUT, when playing in any of our games which include interrupt cards which cancel a previous play (Surprise, Memo From Your Future Self, Stop Time) it’s good practice to play a little slower if you happen to be executing multiple plays, so that your opponents have plenty of time to play one of these cards, should they so desire.