I see... Can I set it to 100c? And for how long?
90C is enough, but 100C is probably ok. Be cautious though - note that the spool gets soft before the ABS somewhere between about 120-150C (I know this from experience... doh). If you've got a multimeter with a temperature probe lying around, warm up the oven first and stick the probe in there to confirm it's fairly accurate about its temperature before you put your filament in.
2 - 4 hours seems to be word on the street; it's a slow process unfortunately.
Depends how wet it is, from your original post it sounds like it might be quite damp!
SD3. Mk2b + glass, heated enclosure, GT2 belts, direct drive y shaft, linear bearings, bowden-feed E3D v5 w/ 0.9° stepper
Smoothieboard via Octoprint on RPi