This is PETG, one was left out in about 40% humidity the other was dried to about 20%
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Yes. Stringy. Some filament types such as TPU are more sensitive to moisture. Dryers take around 7 hours to dry a role. If you had a way to know the moisture content I assume you could shorten that time. Again different filament types dry at different rates.
You can weigh it before you start drying it and weigh it again every few hours until it stops getting lighter.