We had two kegs last night for our house party, and only ended up using one of them. So we got this other keg sitting around, how long will it last for the beer to tasty? We have it in a big tub of snow(we steal snow from the ice rink at school that the zamboni leaves outside) and we have packaged ice on it. We're trying to throw another party this weekend to get rid of it, will it last till then?