I think its time to review the limit of 120 sands.
The ammount of key dungeon runs from a guy that does not have ironite is hilariouly bad.
Even if you don't incriese the regeneration cooldown, at least put the end cap more high, so if someone wants to let it build sands over some time and can do at least 1 Lol key enjoyable from start to finish each 2 ou 3 days that takes to build like 600 sands