I have a website running on one droplet and my domain settings was on Digital Ocean DNS and its all working fine. I made a new website on different droplet machine. I have changed A record of my website to this new IP of droplet machine but it takes more than 48 hours, but still it points out to my old droplet machine IP...

I don't understand what was an issue ? Usually DNS update records at 12 hrs maximum as its already have name servers of digital ocean just change the droplet machine IP but it didn't happen