Yeah, it's enough and ,imo, the best schedule is: 2 on, 1off, 2on, 2 off... However I wouldn't train bis after a back session and tris after a chest one, because tris are involved in all the press movements and bis in most of the back exercises. I'd do tris/bis, back/traps, chest/shoulders and Legs. I'd take wednesday off, and do legs on friday. Hope it helps.