How often (And for how long) do you train Zone 4?

Hello all. I train on a stationary bike as well as a road bike, but have been doing more stationary lately. I’ve read a lot of conflicting opinions on heart rate training zones and wanted to get some input. I’m still somewhat new to bike exercising.

How often do you interval train, and how long is your workout?

Right now I do a zone 4 session about once a week, and do 5 minute intervals with 5 minute “rest” periods, so my total ends up being around 15 minutes in zone 4 and 15 minutes in zone 2.

Just wondering how other people are doing their workouts.

Any feedback, opinions, or input appreciated!