Block Wifi at Night - Using Router Plusnet Safe Guard or another method?

[#1]

Quote from: Anotherone

1) ... Turning off a separate router should not be an issue. If the modem is maintaining sync, DLM doesn't even enter the picture.

But how long would the modem retain sync for when the router was off, could it really survive 7+ hours?
Is there not some form of Ping Pong between the two devices. i.e. Router to Modem Are you there? Modem to Router Yes. Or indeed vice-versa.

[#2]

No there isn't. Sync should be maintained continuously until some external factor affects it - power cut, major interference or other fault on the line etc.

[#3]

That's good to know, thanks for that.