A generally endurable range for most hot bath requirements. 15 - 25 minute baths. Just above body temperature. Ideal for absorption of herbal baths. 15 - 30 minute baths.
Comfortable baths produce heating reflex.
This is a normal range of skin surface temperature. 5 - 10 minute baths. Used only for baths of short duration for the heating reflex, under 5 minutes. Very short plunge type baths for dramatic body heating reflex. Not recommended for longer than thirty seconds.