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So far, based on the Amazon listings for S3, the episodes have been 43.2 minutes long, on average. Over 13 episodes, that gives us less than 562 minutes long, total.
If S4 episodes are at least 56m12s long, then S4 will have more total runtime... and that's not even considering the difference between 13 sets of credits and 10 sets of credits, which would be included in this runtime.
You can buy the series here. As a huge fan of the franchise, $30 doesn't seem unreasonable, but I understand not everyone can or wants to throw that at a show. However, if you choose to buy it, the episodes will be added to Amazon about six hours after they air on SyFy.
I apologize for the blatant product promotion, but I just noticed this and thought some of you might be interested.
Looks like it's the same on Amazon as well, if you'd rather support them as our series saviour!
Also Amazon, apparently. This is pretty cool, I had no idea it was an option.
In the US, yes. You can buy it on Amazon video.
> ... Looks like it's the same on Amazon as well ...
Also $14.99 on iTunes, and the Microsoft store.
(Note: The Microsoft Store says the discount expires in 9 days.
I suppose the same might be true for the other sellers but I can't confirm it.)