Length of time 4 potential overdosing on Vyvanse?

I had started with my first dose of Vyvanse early this morning, at around 7:30AM. Its 7:20PM now. I have taken 5 pills, 30mg each, throughout the day. After I had already downed the 5th pill, I had the bright idea that maybe i should check out what the overdose range is. Most say 140/150 as the number of too much. Ive also seen people talking about taking in the 2-300's themselves without overdosing. I have read the symptoms, and so far I am fine. But its only been about two hour since I took the last. You should also know, Im a recovering drug addict and have experience with extacy and other uppers, so I do know how to tell real symptoms from my mind creating symptoms. But, Im also on methadone which I have been told amplifies many drugs, including this ADD medication.
What Im hoping to find out, since there isnt a clear threshold and tolerance dose, is how long before I have a good idea that Im in the clear? I know that just because X amount of hours has passed and Im fine so far, things can change. Is there any info, opinions even, about how much time till Im in the somewhat safe zone?
I asked Yahoo Answers after 1 hour and got an uninformed opinion by someone who has taken their ADD meds as prescribed. They told me I should be fine, and since another hour has passed I agree.
But this is still an important question, across the board, for any legal or illegal drug...How much time needs to pass? The half life of the drug? Full duration?
Thanks for any help& ideas!
 
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