If you're out for a month, you would be fine, especially if the rifle is floated at the barrel and not barrel bedded solid, which is done in some large caliber rifles. Anyway, I appreciate your comment on marine plywood, I have seen marine plywood last for years on end. Unfortunately, it had about 25 coats of solid pigmented paint on it, somewhat unattractive for my 404 Jeff and all. Anyway, it is a good product, more stable than solid wood, not as stable as synthetic. It will last a month at a time, but who's to say when it will cause your groups to shift. I don't assume risk when it comes to people, and my guns, i.e. my life. Maybe I'm too serious, but that's my view. I don't put laminated stocks on guns I will be using in wet "rain forest" type conditions, like we have here in Louisiana. I do however have Laminated stocks on a nice Remington Mountain Rifle in stainless. Synthetics on a Browning Stainless Stalker, and solid walnut on Sauer Lux 202. These are the guns I use the most, and will be using for years to come, because I will take care of them and use each one in the way it was meant to be used. Laminated stocks in "rain forest" conditions is just not wise if you plan to keep it for any length of time, unless you want to get a new stock for it from time to time. Most of us here have the money to do such things, but when it comes to wasting, I just choose not to, it's just better judgment.
!!ELVIS HAS LEFT THE BUILDING!!