year competition venue position event notes
year
competition
venue
position
event
notes
number
address
number
number hour min sec
number text address rank text time
1986 venice marathon venice, italy 1st marathon 2:18:44
what is the time difference between his best time from his worst finish excluding dnf results ?
WP VBD-AUX DT NN NN IN PRP$ JJS NN IN PRP$ JJS NN VBG NN NNS .