Within 60 minutes of taking it, you should feel a great sense of well-being come over you. Also above average pumps from day one pretty much.
Take 100mg all at once before the next time you workout your arms..... if you don't get a crippling pump forcing you to cut your workout short, it's bunk.
Don't feel too bad if you got ripped off though, most (all?) Ugl dbol sucks