Doesnt work for me. 25 is too long if I’m struggling, and if I start getting into it, a five minutes break spoils my flow. I’ve had more success with “I know you don’t want to do this, so let’s just do as much as we can in 10 minutes”. And sometimes ten minutes is all I need to break a tasks back (writing some email I’d been avoiding), or I kinda get into it and am fine to continue. And if I’m really stressed and just want to escape even after starting, then I go spend some time de-stressing and try something else.