Depends as well if its an injection car or not, there is a fair bit more to one of those than a 1960's mini.
I rebuilt an early SPI into anoter shell for someone years ago and I reckon100-120 hours as suggested above to strip and rebuild is about right assuming you dont do any major rebuilding (i.e sub frame out with engine and back in the car as it is.
If you rebuild it all, clean and paint etc then it will be a lot more.