I fill a spare 6.5 gallon bucket (retired fermenter) will an iodophor solution. I can fit about 24 12oz bottles or about 12 22oz bottles in it at a time. I let them sit in the solution for 1-2 minutes. It doesn't take me more than 10-15 minutes to do 5-6 gallons worth of bottles. I wouldn't use a bucket worthy of fermenting, you wouldn't want to risk the chance of scratching it.
If you have a dishwasher, you could just run them through a sanitation cycle without any soap in it.