> I've done clandestine work over weekends to speed up an application

> I obviously didn't bring to the demonstration that I had volunteered the time, it suited my point to make it seem like it was something easy I could do as an aside

I understand the impulse, but in long term this leads to inflated estimates from management - and tech side has only themselves to blame. When we pretend things take shorter then they really do, dont be surprised when they learn to expect our lie to become truth.

Long term here can be as short as three months.