I've been seeing the same T - and the only T I've ever seen - for almost three years.
Most of that time we did weekly sessions. For a few months early on I did twice a week. Session length started at an hour then went to two hours then reduced to 90 mins.
For the last few months I've been doing an hour every other week, which is largely due to practicalities (i.e. money!)
If I could afford to go weekly I probably would because I find it a bit tricky keeping connection and momentum going. And I think it is also because I feel attached to her so I want to go and see her and talk to her and have my space.
But, overall, cutting down my sessions hasn't been as hard as I expected it to be. I still count the days between sessions but I think there was actually more emotional intensity and pining feelings around that when I was seeing her weekly than now.
It's actually quite nice not having to get on that rollercoaster and churn everything up every single week.