estimates.txt

1. Minimum RTO for a single AZ outage : Just take few minutes if the Multi-AZ deployment has been configured.
2. Minimum RTO for a single region outage : 
00:00 - Problem happens (0 minutes)
00:05 - An amount of time passes before an alert triggers (5 minutes)
00:06 - Alert triggers on-all staff (1 minute)
00:16 - On-call staff may need to get out of bed, get to computer, log in, log onto VPN (10 minutes)
00:26 - On-call staff starts diagnosing issue (10 minutes)
00:41 - Root cause is discovered (15 minutes)
00:46 - Remediation started (5 minutes)
00:56 - Remediation completed (10 minutes)
Total time: 56 minutes
3. Minimum RPO for a single AZ outage : A few minutes of data be lost because Amazon RDS automatically maintains a synchronous standby replica in a different AZ.
4. Minimum RPO for a single region outage　: it's about 5 minutes to uploads transaction logs, so the RPO is about 10 minutes to the replica database.
(Ref:https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PIT.html)