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At first, he often "misplaced" his worksheet by the time he got home, so we'd make a photocopy for him, as conveniently, his twin sister brought home the same daily worksheet.
Ha! As a twin myself this made me crack up.
However - and I'm pretty sure I'm just weird like this - I always get messed up by my habits, in a way. In middle school I decided I would practice my musical instrument at 7:00 every night, whether I needed to or not, and then found myself practically incapable of practicing at, say, 6:45. Actually, I always had to practice at a "round" number: if I missed 7:00 I had to wait till 7:15 or at least 7:05....Nobody in my family does this, though, so I guess it WAS just me.
Either way, forming the habits early is important, but I'd say 20 or 30 minutes tops is plenty enough.