If you only want one file then it should not need the 'time', if you are going to output multiple files you should use the 'time' parameter. For example if you were to output every 10 time steps with a dt= 0.4 you could use the commands:
dt,,0.4
loop,,20
loop,,10
time
loop,,10
tang,,1
next
next
pview time
next
This does 200 time steps but only writes the paraview output every t0 time steps (i.e., at times 4,6,12,16,....