Upgrading ASA 5525-X firepower

Hello guys,

I know there is a lot of hate going on about the Firepower. And i do agree FTD sucks, but i still love ASA's, even if they run with SFR module :).

First time i will be upgrading a pair of ASA 5525-X with firepower. How long will it take going from 6.2.0 to 6.2.3? Trying to plan a maintenance window with the customer.

Going forward upgrading them will be done in the FMC(Upgrading the FMC as i write this, and it is taking ages!)

Process will be:

1. upgrade standby firewall

2. Failover to newly upgraded firewall

3. upgrade new standby firewall

Correct?

I think i will upgrade the ASA image after, to be sure nothing goes wrong. They are running fairly new code. 9.9(1)2