From my experience, it depends on what and whom the affected parties are all dealing with.

If you've any e-commerce features to deal with on the site, that can seriously cause delays. Setting up your own transaction system is a fiendishly more complicated task than working through a company that already has the infrastructure in place and just plugs your company through. The advantage to having in house though, is that you KNOW what is going on and have positive control of the procedure.

But seriously? Unless there's been some sort of MAJOR difficulty, you should be suspicious. Given that you're only talking about maybe 12-15 pages from the sound of it, unless there's an unholy amount of toys being loaded on (javascript, flash animations, that sort of thing), or unless they're running into problems with payment services for e-commerce angles, or unless they are having problems with your company in regards to the site, I'd believe they're stringing you along.

BTW - don't rule out the last. Company that I worked at went through about 5 months of turmoil over the site, because the person on our side (also an owner) kept changing the specs. Usually without informing the folks working on the site.

M