We have taken up to 10 days to get meat (caribou and moose) out of the field but it can be a struggle. Temperature is not the sole factor. The major factor is humidity. The general rule is that if it's dry it can be warm (up to 60*) as long as you keep air circulation good but then you have bugs to deal with; be sure to use good game bags! If it's wet, it needs to be cold (below 40*). Of course this means that cold and dry with good air circulation is ideal, and warm with wet is an absolute nightmare that should be avoided at all costs!