I would say 3.5 because my results were good. 3.5 hours for a partial and trim seemed excessive and my hairdressers own hair looked disshoveled and undone which made me extremely nervous at first. However, she did a good job overall and fixed the few comments I had about the missed pieces happily. I am happy with the finished product and might use the salon again, but find a different stylist. My experience is about 2 hours is usual time for partial and trim, over 3.5 was way too much.