Most likely, Granny is slang, and slow moving. And, at 8 Amps (I too don't know where the 5 Amps came into play; on my 2002 Bolt, 8 is as low as it goes), it'll take longer to top off.
Oh, a AV Turbocord? Where did you buy it (I looked on Amazon, and nothing by that name showed up)? Did it come...