This is completely unacceptable if you're a cruiser. Even with a small, say 400 amp house bank, if you run it down 50% it will take well over 10 hours to bring the bank up. When cruising if I use my Honda an hour or two does the trick.
Rick, you are confusing AC and DC. When limiting my input to 20 amps AC to the charging system, I can run my charger at roughly 2/3's capacity and get about 90 amps DC out of the charger when using one Honda EU2000 generator. My house bank is about 500-550 DC amp, so if I use half my amp hours, it would take about 3 hours to charge it back using my internal charging system and one Honda generator. If I plug in at the dock, I'm looking at about two hours to fully charge my housebank.