I don't know what technology those batteries are. 80F is rather warm for leaving batteries alone.
If they are lead cadmium then several months may be ok and at more modest temperatures even up to a year if they are absolutely full charged at the start.
If lead antimony then much shorter periods. If you can monitor the voltage I would start to get bothered below 12.4v if the period runs into weeks. You will almost certainly be able to recover them even down to 12v ( or pro rata if they are not 12v), but you may shorten the useful life.
If you are not there and can't monitor volts then try to keep the period as short as possible and just hope.
Flux