I definitely must concur with most everyone else. If you have to do that much it's really really shotty. I am fairly new to amphetamines (only experience has been the past two years really just past year) and because I'm fairly new to this game i have done some shotty stuff because I didn't know better. All of that shotty stuff to now having good stuff has taught me that bad stuff you might do it all within an hour and not feel a thing but good stuff it only takes a little bit and you know your high.
I probably have a low tolerance because of infrequent use but still... That's a large dose to not feel anything.
Id like to add though that the mentality "it's bad just do a bunch" is a terrible philosophy. If it's bad flush it and call your dealer, do not continue on. I can speak from experience that it's never worth it and you could end up dead or worse, miserable.