WGTChampion: Free rentals last only 2 hours starting from the moment the rental is accepted.
While this is the law, an expansion is possible:
Equip the rented clubs and start a ranked solo strokeplay game (preferably over 18 holes) in time. You may then leave the game (or save it) and come back any time to test your rented clubs. Rental time will last until you quit or finish the game.
Don't use tournaments as they will expire on their own.
Of course, you can use the regular rental time for other games - only be sure to have a game open at finish time.
P.S. I appreciate a mod's reply!