T, these were done on the grill but you can get good results in a hot pan too, no timer. I do have an instant read thermometer to check temperature.
Once the outside is looking good, reduce the heat to finish, remove from heat a 135 degrees and let it rest.
The potatoes were mashed with butter, sour cream, lots of Parmesan cheese. I boiled them in salted water and added no other salt. Don't ask the time, probably 30 minutes but I just stuck a knife in to check if ready for mashing.