I was wondering how long you will give a routine to produce results before changing things up? And how do you know when a change is needed?
When is a routine change needed?
for me, it's a little intuitive, hard to explain, but i kind of just "know" i need to modify. but i like to keep the amount of time the same, like "im goin for half hour, or im doing an hour." then pickin exercises to do for 5 or 10 minute blocks . this way, you can switch the order of exercises, or drop one and add another but still be going for that hour or however long, and you don't get so bored or discouraged you jump off a cliff. 
That's cool, but I was talking about the entire routine. Like for instance, right now I'm doing a 30 minute stretching routine and 300 jelqs on Tues, Thurs, and Sat. And on Mon, Wed, and Fri I'm doing 300 jelqs and 3 15 minute sets of clamping, along with some [words=http://www.mattersofsize.com/forum/penis-enlargement-forum/12539-slow-squash-jelq-nothing-give-me-better-expansion.html]SSJ[/words] during the sets. I take Sundays off. My question is how long should I give this to produce some results before changing things up, adding more time or different exercises, etc.
I agree with ithiel that if after 4 to 6 (8 tops) weeks you aren't measuring an FSL gain then you've got a problem and need to re-group.
The penis will become used to a work out eventually and either the intensity of the current routine will need to change or a new routine will need to be introduced. This is the reason the [words=http://www.mattersofsize.com/join-now.html]MOS[/words] System is set up into 5 phases, after phase 1 each following phase is mire intense than the prior.
dld, what was the longest time you spent on a plateau of gaining?