Hong Kong was hit with the virus (& protests) a lot earlier than everyone else switching to working from home, so the hoarding problem is no longer as bad for us (hopefully this can reassure those of you dealing with it now)! But if you do encounter people trying to hoard toilet paper, this handy website calculator may be able to quell their TP fears a little with mathematical logic:
https://howmuchtoiletpaper.com
(Tip: scroll down to the 'advanced settings' - they even have options for how many times you wipe hahaha )