Nice Rulles of thumb:
5 times your groundspeed is the VS you need on a 3 degrees glideslope example groundspeed is 150 times 5 is 750 feet per minute descent
6 times the altitude you are flying you can receive the atis or a vor example you fly 30,000 feet 6 times 30 is 180 nm you can receive atis or vor (in good conditions no mountains etc etc)