i don't get home until around 8 or 8.30 on friday nights, but i often discuss something i'll write later with my mum while she drives me to my rehearsals... if i have to i sometimes do a bit while i watch tv after dinner, but only if i feel like it.
a lot of fridays i read books that are relevant to what we're studying, but i hardly ever actually write anything. or i do the fairly mindless bits of homework, like maths exercises and science problems, nothing involving long explanations.