Two weeks ago I went to my '89 Catalina 30 to take it out, and realized I forgot to plug in the shore power from the week before. Both house batteries were completely dead, but my designated starter batter started the engine fine. I motored for about 30 minutes before putting the sails up. Still not enough power from the house batteries to even run VHF or any electronics at all. After sailing I motored 30 more minutes back to the marina and still seemed not to have any charge in the house batteries. How much time should it take for the alternator to charge the house batteries to get electronics up and running? I plugged into shore power, went back this last week and all batteries were charged fine.