Agree with the others. At the least wipe it down with a CLP or oil every day. And possibly look into a different/better holster.
On a funny side note, at least to me, it can depend on the person as well as all the other factors like environment, gun finish, holster, etc. I knew one guy and we both carried SIGs at the time. He had some sort of toxic sweat and could literally start the thing rusting within 1-2 days. Those were the nitron finished P229s. I never had that issue. He had to be militant about wiping down every night or it would rust. Typically nitron was pretty robust but that guys sweat was crazy.