Bury it in dry Nevada or Arizona and the time would probably be a lot longer than any of us would guess. Bury it in Oregon during any month but August and you might be able count the time in hours.
There's no answer to your question. A very random question, it is. Is there any background to help us understand?
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face