Sweet Spot Intervals - How many minutes a week?

I've been cycling regularly for a couple of years now and have just started doing sweet spot intervals on the smart trainer. My question is how many minutes of intervals per week should I be doing to improve my FTP?
Currently doing 2 sessions of 3x8 SS intervals per week.
Mark.
Currently doing 2 sessions of 3x8 SS intervals per week.
Mark.
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What you are doing sounds reasonable and if you do a solid block of it, 3-4 months perhaps, you will get fitter.
I always bang on about consistency and training over a long period to see real improvements in fitness and performance.
People respond to training differently so this is just an example but from personal experience my aerobic fitness was rubbish when I started taking cycling seriously years back (anaerobic was good and compensated for how poor I was anaerobically). The sports and exercise physiologist I did testing with gave me a plan which involved a lot of tempo (basically SS) rides in 3-4 month blocks. This was around 2 or 3 rides per week of between 60-90 minutes in duration. These were full on rides, not intervals.
This made a dramatic improvement to my aerobic capacity but over an 18-24 month period. It al depends on what you want to improve and how committed you are to doing so.
To put it into perspective, power wise, this saw my FTP go up around 30% over a two year period. Those rides went from an average speed of 28/29kph to 34/35kph (roads and conditions were consistent so I think Avg speed is reasonable to use). Like I said, this is personal but it gives an idea of what can be achieved.
I'm looking to improve my FTP and increase my average speed.
Once you get to a point where the intervals are comfortable, maybe even a bit easy I would start to try the longer temp rides outside. Start off with 46-60 mins and then graduate up slowly. If you are doing them at the correct effort then eventually 2-3hr rides at this intensity are feasible but hard.
Aerobic fitness and having a solid base of this is the thing that will get your power and speed up. It does require a fair bit of training over an extended period to do it though.
An example from their mid-volume sweet spot base plan has 6 intervals totalling 36 minutes sweetspot on the Thursday of week 2 then in week 3 you have a similar workout with slightly longer intervals for 42 minutes total sweetspot. By the last week, you have 4x12 minute intervals.
So you might build from 3x8, to 3x10, then 2x15 and so on.
Here's the TR plan I was referring to if you are interested: https://www.trainerroad.com/app/cycling/plans/147-sweet-spot-base-mid-volume-i
One SS session a week is OK for me but a second session may be hills or shorter/ more intense reps
best of luck!
It's also worth listening to the Trainer Road podcasts, they have some pretty good information on them about different training levels and how much to do etc.