I am working on this very large MIP model:
BLOCKS OF EQUATIONS 13 SINGLE EQUATIONS 172,124
I did not expect to get much performance out of this, but amazingly Gurobi solves this thing to a very small gap in a few hundred seconds on my laptop.
The model is still in development and not all conditions are yet properly formulated. I am almost sure we will get into trouble later on, but for now being able to solve these models in one shot is great.
At least we have exercised a fairly large part of the application: retrieving the data from the data base and we also checked plugging in an existing user-provided solution. That means we have stressed and verified a significant portion of the whole system.