Gino Laurence
Gino Laurence voted up Cookie Roma's answer

This is all I can tell you.  I have a cup I use literally constantly.  I too only wash it once a day. I've been doing this for many years and have have absolutely no problem. 

Gino Laurence
Gino Laurence voted up Charles Davis' answer

I have to agree with DDX, it depends on what you're drinking. Milk bad, water, I sometimes go for a few days with the same water glass, as long as it was empty when I used it last. Bourbon, I go sometimes a week with the same glass, again as long as it was empty … Read more

Gino Laurence
Gino Laurence voted up Amanda Wells' answer
Utility software is to do with working with and maintaining the computer itself. Application software is programs that allow you to do specific things (or  applications) on the computer such as creating documents. An operating system is the name given to software that runs on the comuter and allows you to perform … Read more
Gino Laurence
Gino Laurence voted up Anonymous' answer

Utility software is system software designed to help analyze, configure, optimize or maintain a computer. A single piece of utility software is usually called a utility or tool.

System software manages and operates computer hardware thereby providing a platform for other application software.

System software is a type of computer program that is designed to run … Read more