You may not be aware of this, but we are not talking about golf.
In disc golf:
There is no penalty for picking up your marker too soon. Just put it back.
Not that it matters, but I have called time violations. Usually one per new group I play with. The old guy who didn't scout the course and just can't make a tee throw without eyeballing the basket gets a warning and then for the rest of the round they don't walk up the fairway to plan their shot when they are next to throw. And everyone has the pressure of whether to call them for it lifted.
The last excessive time call I made was on myself. We were waiting for the group ahead to clear the fairway, got to talking, then noticed it had been clear for a while, and I had forgotten I was first on the box. I gave myself an excessive time warning.
In general, it is really, really easy to throw within 30 seconds. And 30 seconds feels like an eternity. Those delays you think should have been a violation usually time out to about 28 seconds. The number of calls made is already very close to the number that would be made if every player had a personal timer with a stop watch.