Growler life question

If I get a 64oz (Boulevard Rye on Rye to be specific) how likely is it to be fine for 3-4 weeks unopened and sealed properly?

edit: Went ahead and got 64oz. Must have gotten lucky or something because they poured me 64oz and only charged $16. They do 25% off ever Wednesday, so I caught them on a deal but he must have charged me for the wrong thing or something. I won't feel as bad if the beer isn't as good on the 25th.