Warehouse load times don't depend on your employees at all - you were correct to fire them after they produced for the hour.
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Load times can be found here based on your warehouse level. After they load, click the check box and ship them to your shop - they'll appear there 5 minutes after you ship them!
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Unown has a really comprehensive PT guide here as well
But if you have more questions I'm happy to help!
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(you need an account to see links) sorry probably should have tagged you so you see the reply