If the information is good and the writing is good, I am quite happy to read and scroll down a page that is 15 feet long.
If it's low quality I'll bale out quite early.
Quality is the key, not the number of words.
Although, if you're trying to sell something (whether a product, a service, or just an idea or point of view) it has been proved a thousand times over the last hundred years that Long Copy beats Short Copy, hands down. This is in situations where you are trying to persuade prospects who have some interest, or potentially a strong interest, in your product/service.
However, people who can't write good content will often dispute the Long Copy beats Short Copy argument, simply because it is inconvenient to them.
And there are countless people who will tell you that 'small online shops don't work'. But when you look at their shops you find the only information about each of their products is a postage stamp-sized photo, a Part Number and a couple of random bullet points. And they wonder why no one buys from them!