Max time needed at ITM before take-off is 1 hour. Locals often shave it down to 30 minutes, but maybe that's a bit too tight. From check-in counter to gate usually takes about 10 minutes. It's a small airport.
OP should check the cutoff times for check in and (if applicable) checking bags. There won't be lines between the check in counter and the gate, so the concern is to arrive in time to check in and/or drop a bag.
