It would be anywhere between a year or 5 to do it from the ground.
The fire detection suck n blows (Google it, . ) also have a spotter with them, they're also a ministry employee and usually a firefighter of any type or class. Some guys prefer it (Like my buddy Ron- RIP, you were the best.) And others just get pulled when nobody else is avail. They're tasked with assessing and documenting the starts and existing fires.
It's the Provincial fire services that do the hiring for these positions, and I can tell you that Saskatchewan is hiring right now, but I don't know about the other provinces.
Go ahead and PM me if ya have any other questions,
It's flat out amazing work!