What is the duration of the temporary hit points granted by the Fiend-patron warlock's Dark One's Blessing feature?
2 Answers
Unless a feature tells you otherwise, they last until you take a long rest (or spend them)
Quoting from the SRD :
Unless a feature that grants you temporary hit points has a duration, they last until they’re depleted or you finish a long rest.
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5\$\begingroup\$ Or replaced with another source of temporary hit points, because they don't stack. twitter.com/JeremyECrawford/status/867254585827532800 \$\endgroup\$ Commented Nov 29, 2017 at 16:32
Until they have been used up or you've taken a long rest
PHB, 198:
When you have temporary hit points and take damage, the temporary hit points are lost first, and any leftover damage carries over to your normal hit points...Unless a feature that grants you temporary hit points has a duration, they last until they’re depleted or you finish a long rest.