Okay so a few weekends ago we upgraded 29 servers to SP1 and I wanted share some timings with you.
CAS servers: ~10mins
HUB servers: ~ 15mins
Mailbox Single Copy Cluster
Cluster Node: ~20mins to 180mins!
But that is just for SP1, you need to add time for installing Forefront SP1 too. The longest server we had took 9hrs to upgrade both nodes!
While on timings we are currently seeing Rollup 1 take around 15 mins