I'm looking to test myself and get my one-rep max powerlifting total sometime in the next few weeks (hoping to get at least 1100 lbs/500 kg) and then I'm going to take a step back and drop my lifting to only 2 days per week, one hour sessions. I intend to pick up a day of traditional cardio and a day of Crossfit-style metcon workouts, so that I'm still working out 4 days per week.

What does maintenance look like in that situation? Can I just do something like 2x5 of like 80% of my current 1-rep max for each of the big lifts (squat, bench, deadlift, row, overhead press), and just do the same 2 workouts every week indefinitely?

Is there any good reading material on maintaining without trying to gain or lose strength, in the most time efficient method possible?