I have had an 18V leaf blower and a 40V string trimmer, both Ryobi, for about 5 years. I bought them when we were still living on our 1/3 acre property in GA not knowing what property we might have when we moved to SC. I was pleasantly surprised that both devices handle my 3/4 acre easily. After 5 years, the 18V 4ah battery for the blower occasionally starts to lose steam just as I'm finishing up. As far as run time, I have never actually checked it but I usually spend about an hour trimming and blowing.
Lou Manglass