Yea, a lot of agencies have accounts on p411, I haven’t tried contacting any of them yet, so I am not sure how they respond, but I do have information relevant to this general topic. I didn’t see your original post in time. I started using p411 a couple of years ago, and for grins I started keeping records of how long it takes to get an appointment.
When I send an request from p411, I get a reply 80% of the time. The average time to respond is 32 hours. I actually end up in a room with that provider 60% of the time. 50% of providers responded in one hour or less. I get much quicker responses on weekdays from 9am to 5pm. The main reason for a slow response seems to be that some independents will band together and use an assistant, who doesn’t work off hours, or she is by herself, and she turns her phone off on nights and weekends. After I collected this information a created a protocol for getting appointments on p411:
I start on a weekday, at least six days in advance. I send a request # 1 and wait 24 hours. If I don't get a reply, I send request # 2 (to that same provider), and wait an additional 12 hours. If I don't get a reply, I move on to the next provider. I stop when I get a confirmed appointment. If she cancels, and I still have 24 hours, I start from the beginning. This time I look for providers that have logged in very recently. This helps a lot, if it's a weekday between 9-5, and she has logged in within the last few days, the chances of getting a quick reply is very high. I confirm all appointments at least 24 hours in advance on a weekday at 9am. I wait 6 hours, or so, for a reply to that final confirmation. This gives me a good opportunity to get another appointment.
Some other notes:
Early on, I had a provider pull a total NCNS on me, i.e. I had an appointment, I tried confirming the morning before, per her request, but she never replied. This was the event that caused me to start keeping track. If it would have happened now, I would have confirmed the day before at 9am, and then moved on with new appointment requests at around 3 pm. I probably would have had enough time to get another appointment.
I have only starting using my “protocol" recently, so I think my averages will start going up. I don't send requests late at night or on weekends anymore, and I avoid Sunday appointments entirely.