Turbo trainer sessions

DEZZA53
DEZZA53 Posts: 17
I have recently broken my hand and therefore unable to ride my road bike for many weeks.
In order to maintain some level of fitness (normally out 3 times a week and taking in a sportive when appropriate) I have borrowed a turbo trainer which is set up in the garage.
I have no experience of this so, how long do you spend on it ? do you spin at a constant cadence ? do you do short harder intervals to relieve the boredom ?
Ideas or thoughts please
thanks

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