Practically speaking, how long could someone suck on a cock? Indefinitely?
Assuming its slow and you're trying to go for a long time.
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Ive read some stuff lately about someone sucking for an hour and a half. Seems like its something that you could build stamina for.
I did that a few weeks ago to a big thick hard one. The key was to vary position and technique enough to avoid fatigue. He hated hands too so it was 100% mouth only. After that it took a few minutes for my mouth and jaw to feel normal again.