Both are grammatically correct.
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adsfafHow long was I/ have I been asleep?
Yes, we can guess which items you are comparing, but your presentation is actually very ambiguous.
You could be asking one of these:
Are both of these correct?
"How long was I"
"have I been asleep"
[How long was I / have I been asleep]?
Are both of these correct?
"How long was I I b