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I had an i hirsutum go over 600 days between double clutching but the second sac was bad dried black rock like eggs. The female still hasnt molted, over 900 days and counting. Her MM is tired of waiting.
They can hold sperm till its time to make the sac, like others have said let her hold it for 25-30 days, keep the sub on the other end damp, disturb her as little as possible, put enclosure in a quite area, stop feeding till after you fight her for the sac.
Therte is plenty of front ventilation, look at the strip right below the doors it goes inside right under the doors. I have about 12 of the Exo terra versions all with adult Arboreal T's in them. the flow from lower bottom front to upper top is great cross ventilation