Stopping and thinking ... there is so much to be said for how that destroys time. I have been working 8 days on a job that involved reworking knob and tube (see my post a couple weeks back). You wouldn't believe how having to use a little used wiring method and having to change your thinking will kill your productivity. Bottom line ... 6 days reworking the knob and tube ... 2 days to knock out the "real" part of the job. Common sense would dictate that it would be the other way around, but when you have done something 100 times, you can do a lot more of it becuase of .... what did someone here say, oh yea ... MOMENTUM! Definitly consider this when you bid jobs .. I was afraid of this knob and tube scenario when I bid the job and bid accordingly so I thougt, but did not bid enough!!
