When I help out people I aim for them to get around 90 seconds of TUL. Then I asked them to do a so slow controlled rep at their own pace. If they do a 2-2 = 4 sec rep. 80 sec I would then have them do 20 rep sets. If they do 6-6 = 12 sec rep. = 84 sec. I would have them do 7 rep sets. This way the client can do reps at their own « naturally » controlled speed. They don’t have to focus on a timer, counting in their head or whatever. I find this makes it easier for people to adhere. The only time I intervene is if they do 1-1… Momemtum is a no go ! :)