I have just completed a fishless cycle on my 96l tank.
I didn't use "cycle", but I did use "StressZyme" which I think is similar.
I'm not sure it made much difference to be honest, so if you don't have anything yet I'd advise you to save your money.
It took me about 3 weeks for the cycle to complete, using pure ammonia which I kept topped up to 4ppm each evening.
Very quickly (within a week) the ammonia was being processed completely to nitrite, but it took 2 weeks or so for the nitrite to be converted to nitrate.
I think the best way to speed up the cycling process is to raise the temperature a bit (I set it at 30 degrees C) so the bacteria multiply quicker, and make sure you have plenty of gas exchange (I added an airstone and airpump, and point the filter outlet so it disturbs the water surface).
I also did a big water change (about 80%) after seeing the nitrite levels off the chart for over a week, and that seemed to help speed things up.
When the cycle was almost finished I added some mature media from someone elses well-established tank, just to make sure my cycle was well and truely complete before adding fish.
I you can, I strongly advise getting some mature media to help make things quicker from the start. Unfortunately I couldn't get hold of any when I started mine, but it definately helped once I found some.
And make sure you have a good liquid master test kit, I did tests daily or twice daily for 3 weeks while cycling, so that's a fair few tests!
And now the fish are in I'm testing every day or two so you'll get your money's worth from a decent kit