I’d play every day!  Perhaps some are just 10 – 20 minutes to keep warmed up, but ideally it would be 30 to 60 minutes each day, working on:

• TAC challenge
• Specific, basic area of focus
• songs

I usually play in the mid afternoon, which would be after work during the week.  If I have time I would also like to play just a bit in the morning to get the fingers loosened up.  I play in my office, where I can raise my computer desk to standing height where I watch TAC lessons, look at digital sheet music, or follow some other article or lesson online.