Although both types of order can be made for up to 60 years, 10 to 20 years is more common for Several Orders and 20 to 30 years for Regulating Orders.
Er y gall y gorchmynion hyn bara am hyd at 60 o flynyddoedd, mae’n fwy cyffredin i Orchymyn Pysgodfa Unigol bara 10 i 20 o flynyddoedd ac i Orchymyn Rheoleiddio bara 20 i 30 o flynyddoedd.