in terms of he chain the tightening is really gonna depend on hard hard you work your bike. If your always have the throttle pined then it will cause more tension on the chain which will cause it to loosen quicker.
For the chain lube it would depend on the conditions of the road your are travelling. If its wet it causes the lube to dispear quicker of if there is lots dust and dirt on the roads you are travelling it will also cause the chain lube to dry up quicker.
I would actually recommend using a chain wax as they are also less messy. Try using Bell-Ray. it's pretty good in my opinion, plus it's O-ring safe and non fling technology.
For best results I recommend cleaning the chain before appling the lube then prop the bike up on a the rear set, or a jack with the bike in nuteral and apply the lube at the lower portion of the chain that is closest to the floor between the two sprockets. And the best time to apply the lube is when the chain is hot so it has a chance to seep into all the places it needs to get to make it more effective. To do this go for a quick ride first then when you back from the ride apply the lube right away while the chain is still warm.
If you don't have the owners manual you should be able to find it online.
Here is a list of search results to get you started in that direction:
http://www.google.ca/search?biw=1272...e+Search&meta=