I gave up trusting my factory intalled mental timer years ago. Boiling spaghetti? Timer! Nuking a spud? Timer! Cake? Timer! Medicines? Timer!
I had a squat indigenous housekeeper years ago that put her hands on her hips shook her head and pigtail heavily streaked with gray...
"Senor, every day since birth information comes into our ears. After many, many, years our head fills up all the way to our ears. Then maybe a piece of information of no worth enters one ear, and pushes out a piece of very important information out the other ear". Irrefutable Zapotec, logic.