I train exclusively indoors, for Time Trials
My racing power is currently about 320W
To get past the monotony of indoor training I decided to do the following 2 x per week
400w 1min 150w 1min repeat for 23 intervals, as that is all I have time for.
The NP was 330w for 43min
I would the weather permitting do a road session on a Saturday, 2 x 20min mostly.
Sound like a nice approach. Are you sore after such an interval training?
If not → push harder on the intervals (more watts)
Over time you can increase the wattage in both the on and off parts.
Interested in how you came up with this session? Why 23 reps and do you divide them into sets with a longer break, or just do them 23 reps back to back?
I find it quite surprising that in order to break monotony you decided to plan yourself a couple of weeks of that kind of workouts, instead of doing at least different types of high-intensity work. To be precise - a more typical way of dealing with 3 quality sessions a week would be to do one sprint type of workout, one high-intensity interval workout and tempo ride workout. That would surely keep you out of monotony.
But speaking of your approach specifically - to get yourself ready for a TT race you should (as it’s suggested above) try to do separate blocks of intervals, instead of a dull 23 x 60/60 sec. That would let you ride with more power for longer durations. Let’s say you can change your approach to 2 times (2x4 minutes / 2 min easy) with 5 minutes between sets. That will let you accumulate lactate and move VO2max power, which is crucial at TT races.