[Scott]

801.03 Excessive Time:
A. A maximum of 30 seconds is allowed to each player to make a throw after:
(1) the previous player has thrown; and,
(2) the player has taken a reasonable time
to arrive at the disc and mark the lie; and,
(3) the playing area is clear and free
of distractions.
B. A player shall receive a warning for the first excessive time violation if observed by two or more players of the group or an official. The player shall be assessed one penalty throw for each subsequent excessive time violation in the same round if observed by two or more players of the group or an official.

I've seldom seen this used in PDGA play, and only when a player is consistently holding up play (taking a long time on every shot).

To call it on someone in casual play, that's just bogus.