"How long does it take from training to becoming a pilot flying for an airline?"
Hey Bud, in most cases, it takes a VERY long time to become a 744 pilot. It's hard enough to get hired by an airline. Then you have to start at the bottom of the list. I think it takes pilots +10 years to make it to the 744 once they are hired!
I'm not sure about other countries, but I know most US airlines require you have have an ATP before you even get hired! To get the ATP you have to have 1500 hours of flight time.
It takes a really long time. Don't rush things, your day will come soon enough!