FYI I am just trying to save 173 hours.
| Sl.No | Tasks | Time Required Per VM (Minutes) | Time required for total 200 VMs (Minutes) | Time required for total 200 VMs Per Tasks (Hours) |
| 1 | Moving The VMs to the transport Datastore | 10 | 2000 | 33.33 |
| 2 | Power off the VM | 5 | 1000 | 16.67 |
| 3 | Unregister the VM from Source vCenter 4.0 | 2 | 400 | 6.67 |
| 4 | Reregister the VM in the destination vCenter | 2 | 400 | 6.67 |
| 5 | Changing the VM Network to DHCP VLAN (Say VLAN 15) | 2 | 400 | 6.67 |
| 6 | Powering on the VM | 3 | 600 | 10.00 |
| 7 | Upgrade the VMware tools | 5 | 1000 | 16.67 |
| 8 | Reboot the VM | 2 | 400 | 6.67 |
| 9 | shutting down the VM’s to upgrade the VM hardware version | 2 | 400 | 6.67 |
| 10 | Upgrade the VM hardware version | 2 | 400 | 6.67 |
| 11 | Powering on the VM | 3 | 600 | 10.00 |
| 12 | Reboot again it if the hardware upgrade requires reboot | 2 | 400 | 6.67 |
| 13 | ipconfig/release and Ipconfig/renew | 2 | 400 | 6.67 |
| 14 | Move the VM from Transport LUN to the Normal VMFS datastore | 10 | 2000 | 33.33 |
| 16 | Total Time | 52 | 10400 | 173.33 |