RIP Herr Kaleun.
I will leave it at 128 TC if I'm doing something else in the same room only a few feet away where I can keep an eye on things... and then only if I'm cruising out of range of air cover and well away from any place that's likely to be mined.
If I have to leave the room for a short time but will still be where I can hear any alerts, and not so involved with something else that I might miss one if it happens, I'll drop back to 1 TC.
Any other diversions that are likely to take longer or be too distracting... I just pause the game. Better safe than sorry IMO.