Yes it does reset for free. Better yet without having to subscribe monthly/annually or wait till your next free trial comes up is to buy yourself a Gift Card for 3 months. That way if you do want to finish a longer ride or do more later you have that option.
I did this last year during the winter months and doing it again now. Helps to throw in some variety and I do the C or D rides on the off days or recovery weeks. Also when I need a break from TR I can at least ride or chat with friends or new riders! After the 3 months are up, my training rides are ramping up as planned in TR with my event schedule.