25 years for me. I started when I was 16 working for my best friends dad
who is a Master in TX. I worked every summer for four years and almost
every weekend when school was in session. I showed up for work on my first
day with a 7" standard screw driver with a bent shaft and a pair of Vice-Grips.
My new boss without saying a word, grabbed my only two tools and threw
them in the trash, and handed me a spade shovel and told me,"I'm paying
you five dollars an hour, so don't ever let this bulldozer run out of gas!"
That "Bulldozer" sputtered a few times even backfired once or twice
but, for four years never once ran out of gas. That was back when "Bottled
water" was drinking from a garden hose.