Board Thread:General Discussion/@comment-31090299-20180831121641/@comment-32271305-20180908141054

Hourglasses are pretty cheap nowadays, we've been getting a lot of gems lately, and you can also buy them from the Baba Shop from time to time. The Ginyu Force events have also been released, so it might be even quicker to farm Trade Points by selling their dupes to Baba, than to farm gems in Quests.

I currently have 35 Hourglasses and only a couple units I need to use them on, so I don't really worry about spending them.