If it’s anything at all like the current games on YTTV using the DVR:
if you want to join in say an hour after the game started, you have the options of joining live, start from beginning, or catch up with key plays. You can hold the fast forward & reverse buttons say on a Roku to move around, or you can click the ‘+15 seconds’ or ‘-15 seconds’ buttons on the interface. The DVR will save any recording for 9 months, after that it drops off.