How to deal with the time axis (ie Duration)
 

Lacking duration on the ipad (and not owning OmniFocus for Mac nor a Mac itself) I'm trying ways to get a time axis view anyway.

I toyed with using time contexts: @5min @15min @30 etc... First break was work/private. So then you get @5minWork, @15minWork, etc.

Thought about using time projects but that just makes no sense.

Have been adding time estimate to the subject line since ages -- but when I search for a time too many Done items show up to make it useful.

Folders; normally organized by roles and areas of life. Mixing that up would hurt more than the contexts.

Ideas?