Very little to no difference between 2 hour rate and 20 hour rate with LFP.
Not even close to the issues with lead-acid peukert decline at high rates of discharge.
Most of the prismatic cells I see recommend C/2 (2hr) as the top normal rate and C/1 (1hr) as the maximum discharge or charge rate. Most recommend 2.500 to 3.650 volts per cell. Most of the energy is contained in 3.000 to 3.400 volts per cell. Premade battery cell manufacturer can choose the limits they want to meet the capacity and warranty requirements. All premade battery limits will be different and proprietary. Need to build your own to know your programmed limitations.
I think some of the cylindrical cells may go to 3C or higher.