Sounds like your little'un will get out ok, but do keep a close eye. You are correct in thinking once the membrane is tanned they often struggle to get out unassisted. RodNTN has given some good advice in this regard. Best of luck with your hatch!
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I've had them start to zip then take rests...up to several hours.yeah mine are usually in the half hour to 45 min range for zipping.