My personal experience:
SC has the quickest turn around time - I had 4 pairs of MTO in one order and shoes were completed within 4 1/2 weeks.
Vass can take anything from 7 to 10 weeks. My Cordovan boots were over 12 weeks. This was partly
down to the Shell suppliers in the US.
But in general they are faster than the Brits - John Lobb London are quoting 10-12 months for your first pair of bespoke.
Cleverley not far off....
That's not really fair to compare MTO and bespoke in order times. But your point is right nevertheless - even for MTO they quote months. Or take the Meermin approach, quote three weeks and deliver in six months.*
*(stock items only)