How far is the database server from the node where you are running the install? An install/upgrade is very database intensive so you want to be in the same data center as the database. The more hops across the network you have to do the more time it is going to take.
We wiped out the schemas and invoked install.sh script again. This time, it is still running for more than 24 hrs. Host where script is running is in same data center as the database server. Can you pls suggest.
Did the install finish? At the end of the logs it will have a summary and we can see where all of the time was spent. Was there something going on with the database (backup, someone running log query taking resources, etc.) at the time of the install?