Logic: Once a Gnome, always a Gnome.
If the health/Stat/Whatever loss is the only, or the only serious, negative to haveing your wings down then yes it should take longer to restore yourself. If there are going to be other penalties aswell, loss of mentalflare, stats and hps, lowered xp gain, etc. then I think it should about even on time of loss to time of replenishment.