In that case it took Wolves 6 years, off the back of massive investment by Jack Hayward who rebuilt the stadium & pumped millions into the team (£70m investment apparently, and this was 1990), and the discovery of Steve Bull who in this day and age would have been sold after 1 season.
Sheff Utd had Reg Brealey pumping money in (it didn't end well for him), and they also had Dave Bassett, the serial promotion winner.
Mark Robins is ahead of both- and he has no backing or LT investment plan, no ground, soon as he finds a player he is sold from underneath him, has no funds to buy, and he is operating in a world where the financial disparity between 'us and them' has never been bigger.
There is no metric or measure that you could possibly find that does not conclude that Mark Robins- assuming he keeps this progress up- is doing an unbelievable job in circumstances that no other manager of our club, and few other clubs have faced. It took the backing of Robins to help JH to do what he did, Sillett was a coach & when it came to buying he was suspect, if we go up then Mark Robins is truly on the Mount Rushmore of CCFC Managers with Jimmy Hill, John Sillett, Harry Storer, and there is a slight argument for Bobby Gould.