Hand surface area is often given as 1% of body surface area (1.5-2 m^2), i.e. 150-200 cm^2, unclear if one or both hands but I assume one. I've also found claim

Hand surface area is often given as 1% of body surface area (1.5-2 m^2), i.e. 150-200 cm^2, unclear if one or both hands but I assume one. I've also found claims of 400 cm^2 for one hand. Methanol penetration is predicted at 2.0 mg/cm2/h" would imply that assuming two hands of 800 cm^2 total, exposed to methanol "hand sanitizer" for 5 minutes, would absorb 133 mg of methanol. I think the skin absorption issue is a red herring and the real issue is that people keep drinking it.