I maintain my own website using simple html code. When I make a change
in the code the update goes in to operation immediately on my neighbors
computer but takes from 30 seconds to two days to update mine. I have
maintained this site for several years but this started 4 to 6 months ago and
continues to get worse. My site is a BobBMIller.Com. Thanks!!!

Scleros

Your own web browser's cache settings could have an impact as well as any 3rd party web caches between your site's server and you. Do you and your neighbor use the same ISP?