LFP is CC/CV charged. No Float, No EQ none of that. Now some will "Float" at .5V below full level because they have an inverter ON 7/24 and that is always eating a certain amount of juice, in in power save & idle mode.. some are actually pigs too but I won't go there, I learned that one quickly.
Just remember to do your math by calculating at the Cell Level … so 3.60V X # of Cells for example. and use the manufacturer specs for that, they can vary a little.
Rob Beckers of Solacity Kemptville wrote up this article below and did a very good job of putting into plain English for all to understand.
I KNOW Rob personally and they actually have supplied me with a lot of my gear over the years (only a couple of hundred kilometers from me), so I can drive there when I feel up to it.
https://www.solacity.com/how-to-keep-lifepo4-lithium-ion-batteries-happy/ If you follow the guidelines in this doc you won't go wrong and you can tweak to your specific needs / wants.
. Now, I'm assuming the absorb time is relative to the rate of charge, correct? I see you state up to 15 minutes, but I'm guessing that would differ with different amperage coming into the battery. As far as float, is it true that it could harm the battery? I think I've seen someone mentioning that somewhere, I'm not sure where it was though.
