how many second for each delegate to prepare produce block ?

[bytemaster]

time to prepare a block will not be greater than 2 seconds (enforced by code).   In practice it is milliseconds.

[BTSdac]

if the delegates turn in next round  is known/determined by public (other delegates except block creator )  in the end of previous round . it mean there are only leave 10 second  for the first turn delegate in next round to prepare produce block ( first block in next round )?

and meantime there are 101 delegates  (each delegate) have to prepare produce block (first block in next round) in period between last but one block and the time he receive the last block of current round

I don`t know if this is the reason of fork