3500 blocks in 1 hour. 
Too many people digging, that is the disadvantage for the later. We decided to restart the block and run the Explorer again within 1 hour
What about those that found blocks on original chain? You will compensate on the new chain for their time and effort, the early adopters and believers of your technology? You should pay out anything below block 3500 to those who send you wallet file of old chain.