"Hour labor" refers to the work or services provided by someone for a period of one hour. It represents the amount of time spent on a specific task or job. Full definition
Soon I'll have the time to sit down and recap the 22 hour labor process, but in the meantime I thought I would share a glimpse into our first days as parents. (livehalffullblog.com)
A normal charge for this should be 0.5 - 1.0 hours labor max, plus maybe $ 10 for the dye. (mechanics.stackexchange.com)