Front end rebuild - what's it worth?

.....and remember a "tight window" tends to invoke the Murphy's law clause where if you think it will take 8 hours, it will actually take 36.
Everytime! And the stress and skint knuckles to boot! Plus, some people wanna do something by a certain date. But neglect to tell Ya. So there is a possibility of a bitter taste if time frame is not dead on