Obviously
"It's not obvious why the user is in such a hurry to move. Although R12.2 was introduced in 2013, Oracle says Premier Support will be available until at least 2031."
Well given the time it will take to issue the contract requirements, allow the proposals to be submitted, review the proposals, select a winner, suffer through the protests, issue the contract, on-board the contractor, bring the contractor up to speed, suffer through the contract mods, finish the system, test the system, configure the system, test the system with users, reconfigure the system, plan the transition, and go live, I'd say 2031 is a realistic end date.