Pradeep,
Don't worry too much about the runtime.
It will depend on what values you provided for the number of processes (config phase), the delta of your upgrade (stack you are coming from and going to) as well as the capacity of your machine.
Next time you can increase the number of processes during during the uptime phase. Be careful though overdoing parallel processes can also have a negative effect if you get to greedy :-)
Cheers,
Amerjit