It's MY rod, and MY shower...I'll wash it as often and as fast as I please !!!
I can only say that, since I started cleaning my rods/reels in the shower, I've had no corrsion problems. Problem spots used to be the guides and reel foot (feet? foot?). I remove the reels from the reel seat and flood the seat area....it's all about eliminating salt hiding in the nooks and cranies.
Me, 2 rods and a cold beer in the shower....the wife just doesn't get it!