Pretty much the same top speed I get on my similarly geared derailleur bike.
A Sturmey-Archer XRF8(W) IGH fitted with a 19T cog, driven by a 53T chainwheel and on a bike with 700Cx23mm tires would have a 238 gear-inch top ratio. Pedaling 90rpm on the cranks, this would give 64mph.
See starting 2:17
here.