Given an acceleration of order

                         -4     2
              a =  1 x 10    m/s 

if we wait for one year

                                        7
              t =  1 year   =  3.16 x 10  s


then the change in velocity would be

                                            -4    2                7
              delta v  =  a * t  =  ( 1 x 10   m/s  ) * ( 3.16 x 10 s )

                                            3
                                 ~    3 x 10  m/s

 
                                 ~    3  km/s