I'm just short of 78 hours this month and have a little more than 78 hours with 18 days off in July. Both months were at 87+ when my lines were awarded. I usually bid 3-day trips, partial weekends even. I can drop turns and 2-day trips during step trading often.
I don't personally like to go to low 70's, because I'm hoarding cash. But, it's doable. You just have to try to trade for stuff that you can easily get rid of through p2p.
With that said, I do have a little seniority. I'm a 2006 hire and top 100 on the SEA FO list. So, step trading has been okay.