I thought I would share a work around for the lack of ability to set the available time in the daily plan. Not ideal of course, but it does work.

You may have thought of this already, but if not it may be helpful.

Put in a dummy task/placeholder that takes the hours up you don't have to use now, that make up the rest of the eight hours doit has given you. That is what I am doing right now, not perfect, but it does work, then the hours available goes down and you can work it that way. You can edit this on the fly when you review the daily task, like if a half hour has gone for some reason, just edit it then, and your available time goes down.

support have said they are looking into sorting this out properly in time.

Hope this helps.