Samurai
Adventurer
If you want to extend the healing times a bit, you could say that an Extended Rest heals half your total HPs and returns 3 Healing Surges. That would mean it'd take about 2 days instead of 1 to fully heal, or you could use 2 of your regained Surges and heal back up to full in 1 day, but then be pretty spent as far as any further healing that day.