how long should it take to mow 3 acers of grass with a b7510 and 60 inch m.m.m and hydrostat trans?its flat land some trees a barn and some other obsticales to mow around.and how do they do for mowing anround trees do they get close enough?i just bought it a month ago it moves snow great with a rear blade and loader.this is my first hydrostat tractor ive had 3 other bigger gear drives.so far i love it and think mowing time will be cut down.it used to take me 1.5 hours with my gear drive and rear mower.