Generator usage for two hours in the morning and two hours in the afternoon should be fine with a system having an Echo charger, and providing the merge switch had been in the off position during drawdown.
In another life as a fulltimer, and spending lots of time dry camping, I used the inverter/charger amp meter to determine my generator run time for each day of running. When the charging amps dropped to what I considered 'minimal gain', I would usually shut down my generator unless I was running a high inverter load such as a microwave.
For those not familiar with the Echo charger; on most coaches having one, it's located behind the main engine door, in the compartment under the hydraulic tank. If the coach is on shore power, the indicator light should be green
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