Understanding that you want something electric, have you completely disregarded the option of a battery powered mower? They have come a long way and the EGO 56 volt system with the 7.5 Ah battery and rapid charger can pretty much go non-stop with two batteries. It has a 60 minute run time and 60 minute charge time with the above mentioned batteries and charger.
I looked into the battery operated mowers extensively and quite honestly the EGO is the best you can get. If you wanted something durable, you can even get one with a metal or alloy deck.
If you are sticking to your guns and want corded electric, I am sorry, I have no advice.