We are planning to upgrade 12.1.3 EBS instance(one node) to 12.2.4(one node). And database will be upgraded from 18.104.22.168 to 12C. Are there any steps like how to reduce downtime for this upgradation. Actually we have a limit to do it within 150hrs and next iteration in multi node it has to be done within 100hrs next 90hrs. So is there any specific area where we can reduce this downtime and do the upgradation very fast.It will be done on Red Hat linux 6.5.Kindly suggest.
Refer the below documents,
Best Practices for Minimizing Oracle E-Business Suite Release 12.1.3 and 12.2.n Upgrade Downtime (Doc ID 1581549.1)
Database Preparation Guidelines for an E-Business Suite Release 12.2 Upgrade (Doc ID 1349240.1)
Upgrade Advisor: E-Business Suite (EBS) Upgrade from 12.0/12.1 to 12.2.x (Doc ID 1593640.1)