Hand sanitizer is a good way to keep your hands clean and sanitized and kill germs and viruses when you have no access to regular soap and water.
So you can use the hand sanitizer 2 to 3 times per day or as often as you need to use it.
However too much use of hand sanitizer may cause a burning sensation or rash on your hands or dry your hands out.
So make sure you also wash your hands off with soap and hot water when possible as well.
I use hand sanitizer at least 3 times per day when I'm not near a sink but I also make sure to wash my hands 3 times per day as well especially after using the restroom, before I eat food etc.
You want to wash the hand sanitizer off your hands before touching food as well because the taste of the hand sanitizer can and will transfer to your food that you touch so wash the hand sanitizer off your hands.
Make sure to scrub your hands down really good with antibacterial soap and keep the soap on your hands and rub your hands together for a minute or so.
The longer the soap is on your hands the more effective the soap is at killing the viruses and germs.