From which we will block the normal reward?
34 days from the start.Quote
WHAT IS SLOW-START MINING?
While we have taken every precaution (and subjected the code to security audits), we are unable to guarantee that the Zcash code is 100% free from bugs and security vulnerabilities. In order to minimize the impact of any unforeseen problems during the launch of Zcash, the amount of ZEC each time a block is mined will start at zero and gradually ramp up to 12.5 ZEC after 34 days.
While we have taken every precaution (and subjected the code to security audits), we are unable to guarantee that the Zcash code is 100% free from bugs and security vulnerabilities. In order to minimize the impact of any unforeseen problems during the launch of Zcash, the amount of ZEC each time a block is mined will start at zero and gradually ramp up to 12.5 ZEC after 34 days.
time 
