Odyssey does seem to recommend trickle charging for 6-8 hours after bulk and absorption charging:Low and slow 'trickle' charges performed on a regularly deeply cycled AGM battery, but especially a TPPL agm like Odyssey, tickle them to death.
and long slow deep discharges are very hard on ANY lead acid battery, whether flooded gel or AGM
I feed my Northstar TPPL AGM with either a 40 or a 100 amp adjustable voltage power supply, and more than once, both of them together for ~134 amps. TPPL AGMs are beasts, but they are not immune to improper recharging
To achieve maximum life from your ODYSSEY battery after completing the charge time in Table 5, we recommend that you switch your charger to the trickle charge position and leave the battery connected to the charger for an additional 6-8 hours. The trickle charge voltage should be 13.5V to 13.8V. .......The battery should be trickle charged after high rate charging, regardless of its initial SOC