I just had this problem whe I was in Zion. We all were out at grafton, the ghost town, and I was doing interior shots of some walls. I was shooting fp4 rated at 65. I didn't do much in the way of mental gymnastics. my initial reading was at f11 I got 8 seconds. So I quadrupled it for 32 seconds. I gave it 20% more development when I processed the negs. I'll add one of the scans of my work prints in a few minutes. All turned out fine. I also forgot I had the yellow filter on the camera.
The work print is actually lighter than what the room was lit. There were windows, but the fast work print I did, I didn't adjust. I just did a straight print with no buring or dodging.