Is there limit on work permit extension?

[sonjy]

I heard this from someone with a work permit (semi-skilled level) here in Alberta. He said there is a total of 4 year limit on work permit and you cannot extend beyond that point.

Is this true? Does anyone know about this regulation?

I thought you could keep extending work permit as long as LMO is positive and you have a job offer.

Please advice. Thanks.