BrettyD my mistake, the thread was called post your test data not results.
We spent a lot of time trying to address why so many people were having problems when cycling their aquariums. Particularly fishlessly.
A lot of knowledgeable and useful members participated in that thread and here is one of the papers that came out of it.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC124703/#!po=13.1579
This is an experiment conducted by Dr Hanovec and co. I believe he is the founder of Dr tims products?
Of course the experiment was carried out under perfect conditions that may or may not exist is some of our aquariums but the the results according to these scientist were 'to be expected' and the dates for establishing a nitrogen cycle are described within.
This article also explains how it is not the commonly thought nitrobacter that is found during the nitrite oxidising phase but rather nitrospira. The article supplied by Andy has data for nitrobacter only and is perhaps a little outdated.
I was never a big fan of Dr Tim because I believed he was just a salesman in a lab coat trying to baffle people in to buying his products.
What is interesting is that many commercial bacteria additives contain the nitrobacter strain however, These experiments show that aquariums that received the additives did oxidise nitrite faster by a few days but the only hypothesis is that the additives contained nutrients and vitamins that may have stimulated reproduction.
Cycles in reality are a different beast however I would be a little concerned if a cycle was taking more that a month and a half. Things that affect the bacteria are the parameters of which are described in Andys article for sure but others play a major role too. Alkalinity and available nutrients for example, phosphorous of which is a major player but is very low in most tap waters. The more ammonia you add the more these vital nutrients are drawn upon and the more likely the cycle will run in to problems.
Then there are the things the aquarist did not tell you for example, they washed the sponges mid cycle or the didn't dechlorinate their water or there water is too soft and devoid of nutrients. All bacteria need to draw on these nutrients and there are a lot more in our tanks than just the ones we want to see for our cycle.
Test kit errors, impatience, interfering all these can cause problems with a cycle and make them seem longer.
The fact is that with exponential binary fission remaining constant under the right conditions (of which most of use provide) the cycle should in theory be established by day 38.
Then comes the addition of more livestock more feed, washing of sponges, disturbing gravel, medications etc etc and all these can upset the cycle and cause problems. The bacterial bloom comes next followed by ammonia spikes, fish deaths etc. just take things easy and don't mess too much like I did.
Good luck.
Hope this helps.
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And those numbers were way off for the tanks that took 4-6 months to cycle and these tanks had similar water parameters to ones that only took 6 weeks. There are just too many variables. 
