2 atmospheres (10 mtrs / 33 feet) is the limit you are looking for. "theoretically" you can stay indefinitely at that depth with no decompression obligation. as pointed out above, you still need to control ascent rate and breath continuously.
i would also add that if flying anytime after breathing compressed gas (diving in the pool for example) you may want to consider making sure you have at least 12 hrs out of the water. more is always better but do whatever you are comfortable doing.
i would also add that if flying anytime after breathing compressed gas (diving in the pool for example) you may want to consider making sure you have at least 12 hrs out of the water. more is always better but do whatever you are comfortable doing.