What do you think of this proposal to speed up the recruitment of units?
Partial speed‑up (relative):
The player pays an amount of gold or demonic stones to reduce the remaining time by a fixed percentage.
(for example 25%, 50%, 75%, 100%). Each price tier is linked to fixed percentages.
Instant speed‑up (instant):
The player pays enough gold or demonic stones to complete the recruitment immediately.
Cost scaling:
Make the cost increase proportionally with the base recruitment time and the unit (rare or stronger units cost more).