My group 34R Odyssey never gets completely recharged (= 12.6 or 12.7 VDC resting charge) unless I drive about 100 miles or more on the highway. Around town driving never seems to fully recharge it. I'm thinking this is common with AGM batteries. Supposedly they need a longer time period of charging to fully top off than the old fashioned SLA batteries do. They still last me 7 years or more in service, but I have definitely confirmed the lack of full recharge from short trip driving on my vehicle.
Every once in a while, I attach my CTEK Multi US 25000 charger to the Odyssey 34R, and it takes about 3 hours on the CTEK to fully recharge it after weeks of city driving.
YMMV, as always. Good luck with your battery fun!