The shop
Sonoran Edge Electric runs seven techs out of a strip-mall bay in west Phoenix. Half the work is service calls: panel diagnoses, breaker swaps, troubleshooting hot tubs that won't trip right. The other half is light commercial: tenant fit-out punch lists, suite-level branch circuits, the occasional code-correction job. Marco Reyes started the shop in 2014 after a decade with a larger contractor.

What was slow
Every service call eventually hit the same wall: a code question. Breaker sizing in a sub-panel feeding a detached garage. Whether bonding rules changed for this kind of pool. The exact wording of 210.8 since the last cycle.
The options weren't great. Flip through a beat-up paperback in the truck. Five, ten minutes if you remembered the right article. Call a buddy who might be on a service call himself. Google it and wade through three forum threads, none of them current.
"Five minutes here, ten minutes there. Across a day, that's a job."
What changed
Marco's techs started keeping NEC Chat open on their phones. Type the question the way they'd ask another electrician ("what size breaker for a 50A spa with a 10-foot GFCI rule") and get the article, the relevant subsection, and the answer in plain language.
Now the truck stays running. Code questions get resolved at the panel. The codebook stayed in the truck a few months out of habit, then went on a shelf.

About 12 minutes saved per lookup, by Marco's count. Multiplied across seven techs and a half-dozen calls a day, that's a real number. Most of it shows up as one extra service call in the schedule.