BULK means ultimate charger potential. Nothing more, nothing less. Meaningless unless prior data is utilized ? x time = x? time
How many minutes starting from 50% SOC to 100% state of charge.
Some of these answers can be reformulated to assume changing from a porcelain sink to a stainless steel sink will make the sink fill faster.
You have a battery that will recharge x amp hours. You use a specific size charger (too small) then expect the battery to fill faster?
An AGM unless it is junk will accept a higher amount of bulk amperes. At what point in SOC does the battery revert to absorbsion charge? Any answer is based on pure assumption. BRAND of battery. Amount of recharging amperage which is utterly based on constant voltage.
For fastest charging the Lifeline is unequaled. It can accept way more bulk charging which means to me, saturated absorbsion up to the point where absorbsion kicks in at a higher state of charge percentage wise. When the Lifeline backs off of saturated charging amperage it is fuller. Clear?