I dont know the exact stat off the top of my head but beleive about 75% of people dont go back to the same realtor. As for referrals, the source of the referral is just as important as the referral. Go to someone you respect enough to beleive they know the difference between good and bad service.
The three days part is not unusual. Sometimes clients are out of the country or unreachable. Other times the agent is delaying with the sellers knowledge to see if any other offers come in. As for me, as soon as I get a call from an agent that is submitting an offer I always call my client as soon as I receive the offer. Sometimes I tell them its coming but 50% of the time an agent says one is coming it never does. It’s generally better to wait until you have it in hand to spare your client the emotional rollercoaster.