I was wondering if I turned into a vampire in Skyrim, how many times can I feed in order to turn myself back to stage 1?
I am under the assumption that NPCs don't respawn, so there must be a hard limit to the number of times I can feed on them to turn myself back to stage 1.
There are no limits to how many times you can feed as a vampire. Feeding on an NPC won't lower the health of or kill the NPC. Also, there's no need to feed multiple times at one feeding interval, as feeding once always returns you to stage one vampirism.
More info at the UESP wiki's "Vampirism" article
