Minimum slider

It would be good to be able to say “I need to do at least X minutes cycling” (where X is how long the commute or whatever takes), but leave the option for join to recommend either a longer ride or reccomend a workout to do within that minimum time. So if join thinks I should do 5 hours that day, I can take a more scenic route for my commute! At the moment, the only option is to tell join I have a planned workout, but then I am probably under-loading, especially if I am commuting 3 or 4 days per week.