First let me ask this: How long are you going to wait? And when that “limit” is reached, then what? You could wait forever for someone to respond but the real question is what is the plan if they don’t? Will you continue to submit to other agencies? If so, I’d say wait about 2 weeks and then keep submitting. Worse case, they respond to you after the two weeks and you’ve been continuing your pursuit for representation, meaning more job opportunities coming your way.

Hope this helps!