Hockey punishes full-session recording more than almost any other sport. Play is continuous, the puck or ball changes ends in seconds, and the thing you want to review is over before you have decided it was worth reviewing. Record the whole game and you get a 60-minute file in which the coachable moments are scattered and unlabelled, so nobody watches it back.
The rolling buffer inverts that. ReplayR keeps only the last stretch of play in memory and overwrites the rest. You react after the fact: the breakout goes wrong, you tap your watch, and the 90 seconds that led up to it are saved, including the positioning that caused the problem two passes earlier.
Buffer length is the only sport-specific setting that matters. Ice hockey shifts typically last 40 to 60 seconds, so 90 seconds captures a whole shift plus both changes. Field hockey, played in four 15-minute quarters under the FIH Rules of Hockey, runs in longer passages, where the 3-minute Pro buffer covers an outlet to a circle entry end to end.