My kegs seem to last between 1 month and almost a year. Something really big, really special I might only drink a few pints a month. Interesting to see how some beers change over that long of a time. Most lighter easier drinking beers may be a month or less depending on how many friends are...
I keep a second co2 bottle and regulator in the beer storage area and pressure the kegs up as soon as they're filled so they are ready to go as soon as 1 blows. Plus if I have a party or something going on and want I can put one or two kegs on picnic taps to go with the 3 in the kegerator and...