How long can you stay at 85 feet diving?

Question

How long can you stay at 85 feet diving?

Answer 1

If you go by the us navy dive tables, you can stay an hour at sixty feet. so eighty five feet at around 35 minutes for a no decompression dive.

Answer 2

Without looking at the table, I'd say it's around 30 mins on air with an 80 ft^3 tank plus a 5 min safety stop. No deco.

Answer 3

It depends on how much air you have, and how long you want to spend decompressing.

Answer 4

is this a joke?