It is difficult to tell any screen printer how to set up their dryer as there are so many different sizes and styles. Good advice is to control your belt speed first.  We always prefer a minute to minute and a half in the dryer.  Once you get the belt speed where you want it, adjust the temperature so the Thermolabel fully turns black at the desired temperature.  This is usually 270ºF for ELT and ELT-S Series.  Small electric dryers may not allow for a minute dwell time.  We strongly urge our customers to use a 30 second dwell time at an absolute minimum in these situations.  Minimum.