5 - 10 mile Turbo training

As I am a shift working on 12 hour shifts find it hard on work days to fit time for going out on the bike and little for the turbo trainer.
However would say a 4 mile going at 80% on the turbo then 1 mile @ 90-100% be worth doing or not, this would to me be around a 20 min session give or take.
Or would it be better stretching this out to 8 miles and 2 miles?
Or much point at all and just save it for my days off and get a good 20-30 mile one in on Zwift or another app?
However would say a 4 mile going at 80% on the turbo then 1 mile @ 90-100% be worth doing or not, this would to me be around a 20 min session give or take.
Or would it be better stretching this out to 8 miles and 2 miles?
Or much point at all and just save it for my days off and get a good 20-30 mile one in on Zwift or another app?
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Also so I am fit for the coming year which will include a couple of smaller sportives 40-50 miles.
On top of this have the ability to do longer runs for leisure, and just general health and fitness.
I also do a little running approx. 10 miles a week running and some basic weights in the gym when I can fit it in with a lot of dog walking.
Various vids including many Trail Centres