Eagle Tool US EA75036 Auger Style Flex Installer Bit for Wood 1/4 Shank Diameter 3/4 Head Diameter x 36 Length

I read reviews that it gets dull quick, has that been the case with everyones experience with the 3/8 bit?

I have to run 12/2 single line what size drill would you recommend

How could this work with your extensions when this has a triangular shank and the extension has a 1/4 hex end ?

Do you have a wood auger bit(made in USA) 18" long?