Trying to wrap my head around absorb time here. If I understand your comment here, you're basically saying that the higher the absorb voltage, the shorter the absorb time is needed. So converting for a 12V 200Ah system, does this make sense:
14.2-14.4V for 30-60 minute absorption and/or .05C tail current (10A)
13.8V for 2-4 hour absorption and/or .01-.02C tail current (2-4A)
By the way, my battery manufacturer (Powerurus/Roypow) recommends 14.4-14.6 and an absorb time of 2 hours and a float of 13.5.
So I assume that the first case (higher voltage, shorter absorb time) gives you a few more Ah's into the battery. Are we talking like 3 or 4 Ah or more? And I assume the second case (lower voltage, longer absorb) gives a bit less capacity but you will likely extend the number of cycles of the battery. I'm thinking in our use case (RV), since it won't see daily cycling, we might be better off just charging based upon the first example of 14.2 for a 60 minute absorb time.