Remember, if you return to office for 2 days, they'll ask you for 3.
Remember, if you return to office for 3 days, they'll ask you for 4.
And if you return to office for 4 days, they'll ask you for 5.
Maybe sick days happen more often on office days... I'd be sick of the drive if I was near an office. And office days are great days to volunteer - you're already in the city!