I would still be interested to know what "Durability 50 hours period" means.
One interpretation would mean that it would be quite easy to wear it out in
a year. The other means that you can pull the trigger on and run full
throttle until it is out of gas--stop and fill 'er up, and go tankful after
tankful like that for a total of 50 hours before giving the saw a rest.
That's two days around the clock. No one in his right mind would run a saw
like that.