Saw this on Reddit and thought it was worth posting it here [ Edited ]

[Humplemann]

https://www.reddit.com/r/PlantsVSZombies/comments/bkp5q9/takes_more_time_but_save_a_gauntlet/

This seems worthwhile. 

I can't see any reason why it couldn't be used endlessly, as long as you've got the patience or find yourself needing to put off the time where using gems for additional Gauntlets comes around.