What would the maximum uptime for the router without me changing settings for the dlm to settle on my connection? To see if fastpath would come back
That's a simple question with a complicated answer.
The first part of the answer is that, if you need to manually disconnect the modem or reboot it, then it is best to leave it disconnected or powered off for at least half an hour. That way DLM doesn't mistake it for a failure, so won't include the resync when deciding to intervene further.
The second part is that DLM has a complicated way of deciding when to reduce its level of intervention. It bases that decision on seeing a low level of errors and a low level of disconnections for a certain number of days consecutively. Depending on the history of the line, and any recent errors, that could be anywhere from 1 day to over a month.
It certainly pays to make sure that DLM doesn't see any unnecessary resyncs nor any unnecessary errors. The ASUS does you no favours there, because you can't see the important error statistics. And, to be fair, DLM likely intervenes most because of error rates, not disconnections.
Am i right in saying that 11.8 attenuation means i should get pretty close the 80mb? I have seen my max sync rate at 110,000kbps
12dB attenuation should give you a very good chance of getting 80/20 speeds. One old line of mine was 16dB, and got 80/20 at first, but gradual increases in crosstalk took speeds just below. My current line is 8dB, and easily gets 80/20 speeds.
Unfortunately, the "max attainable" figure is one of the ASUS values I don't think is trustworthy, so I don't know whether you can believe it. However, if you were one of the first subscribers to get service on the cabinet then it is a plausible number.