I do each muscle once a week and my chest workout takes a little over an hour not including warm up. Would this be over training?

Flat Bench: Drop Sets.
Set 1: 275x4, 205x6, 165x6
Set 2: 255x4, 205x6, 155x6
Set 3: 235x4, 185x6, 145x6
Set 4: 225x4, 175x6, 135x6
Incline Bench: 3x8reps (185)
Dumbbell Incline: 3x10reps (65s)