Stalling solution

[Bulby37]

Even with 20, they fill up quickly if you happen to come across stallers. Since you brought it up, one of the more appealing things about this game to me is the fact that the devs didn't compromise their vision to make a money sink out of the game. I see the 4 day limit as the devs being a bit too kind and forgiving of casual players than a ploy for cash.