Way back when we carried Beretta 92s, mine became completely submerged in chest deep water while I was fording an overflowing drainage ditch that got hit with a 100 year rain storm. My call was to try to make it to a woman's house who had just had open heart surgery, was there by herself, and needed to be prepped for extraction via John boat.
I would estimate that pistol was submerged for up to 30 minutes.
A simple field strip, cleaning, and compressed air blowout was all that was needed and the pistol never gave me any issues until I traded it in on the department M&Ps that replaced it. Only issue I ever had with the 92 platform was a broken firing pin and that was from too much dry firing in an active shooter class where they zip tied our barrels but you could still dry fire double action.
Regards.