Hi Igor ,
To add to what Hui has posted , Rig 2 is available from 1-6-2015 , which means it can be put into use from ID 7 itself ; if it is introduced at this stage , then interleaving Rigs 1 and 2 means you need not have any move time of 5 days between uses , since while Rig 1 is being used for drilling , Rig 2 can be moved to where ever it is required , and vice versa.
The same principle can be extended to Rigs 3 , 4 and 5 as and when they are available to be put into use. At this stage it is governed purely by the distance between drilling locations.
Narayan