Pomodoro should be 25m blocks or 90m blocks for ADHD?

I will be honest, I don’t know if Im ADHD or not, but been practicing focus sessions last 5 years, just by booking time in my shared calendar so everybody can see Im busy at that time. Never heard about Pomodoro as term before 2026.
Almost all of my blocks are 1-2h because first 15-20 minutes is building up flow.
30 min blocks were rare just because I had no more time, I spent it answering emails only, because nothing else I could do within it.

Now everywhere in the apps, I see pomodoro 25m blocks and almost never 90m blocks. I never get that, you just enter flow and you have to interrupt it. every single time.
What worked for you guys?