offsetMotionPath

# select object on motion path- needs animation keys already set
from pymel.core import *
duplicates = 5
startFrame = 0
endFrame = 100
offsetAmnt = float(endFrame)/float(duplicates)
sl = selected()
objectList = sl[:-1]
pathCrv = sl[-1]
for o in objectList:
    offsetBy = 0
    for d in range(0,duplicates):
        dup = duplicate(o)
        moPath = pathAnimation(dup, c=pathCrv ,startTimeU = startFrame+offsetBy, endTimeU = endFrame+offsetBy, follow=1, fm=1,fa="x")
        offsetBy += offsetAmnt