you can get back to about 80% at what ever max amps the batteries will accept
then approx 2hrs to from 80% to 90%
after that from 90% is a long run time, in the summer needing A/C it happens almost everyday
but in weather where the A/C is not needed, a conscious effort must be made to spend the GAS and effort of charging the batteries
spending 24Hrs or more on shore power should accomplish this, IF you did NOT allow them be be run down below 50%
but don't expect a full rehab, on an overnight 12hr charge, in at 6pm and out the next morning
i think your plans are reasonable
of course NO battle plan survives contact with the enemy, in this case 'weather' and use/abuse are the enemy
enjoy your big trip