Is the recruit you are going for projected toy our level or to D1? If he is projected to your level, then as long as you get to at least high on him the chances he signs by end of period 1 are very very high.
If he is above your level than there is 0 chance.
From the HD 3.0 guide:
SIGNING PREFERENCES:
Players are programmed to want to sign at different times - not everyone signs right away. In fact, probably only 5% of the players sign on the first cycle after signings start, with more signing each cycle.
Whenever: Will now have about 50% chance of signing at some point in period 1 and 50% chance in period 2.
As Soon as Possible: They will definitely sign by the end of period 1, unless no team is high or very high.
By the end of period 1: Almost all will sign by the end of period 1, with odds increasing each cycle.
Late: None will sign in period 1, but almost all will sign by the end of period 2, with odds increasing each cycle.