Most laser tubes have a “10,000 hour” norm lifespan (from time of production to rated shelf/use life). Kinda like expiration date on food packages.
Now from reviewing the other laser groups and postings, a better quality laser tube will be up in the 20,000 hour range. With 8,760 hours in a year, that means up to 2 years of normal usage/lifespan.
With heavier usage and depending on environmental temperature controls, optimal performance lifespan will decrease (thus warranty of 12 or 18 months - previously 6 or 12).
Now as to the 2 months and $300 reference, I am not sure how that was supposed to be communicated or if that was even just a thought that started in the head but got jumbled in delivery to the mouth or fingers.