While the answer to this is you're definitely looking to do it just right between those two extremes, I would rather have too much, both as a writer and a reader, than too little.
For me, the action isn't the juice, its the characters' reactions. If the author has just taken my favourite characters to the brink of the abyss and brought them back, if I don't get to hear how they felt about that, then I've probably just rated it somewhere between 'meh' and 'meeeeehhh'. Bad endings define books for me. Its not that an author can't tell me how they felt about it all in a page, or give me enough clues to imagine it myself, its just that takes some serious damn chops - and it also takes a lot of groundwork on establishing how the characters react before hand, so that when the climax comes, the author can use the shorthand they established before hand to trigger the emotional response without needing to go into depth.
Even then, I just prefer people to show me the mess getting cleared up. Give me that chapter of emotional responses and ends getting tied. I don't just think its easier to do, I also think its more fun to read. Which may inform my stance. I'll even read multi-chapter triumphal processions if I like the characters - hey, why not? Its not often you get to see the peeps you're rooting for actually fully happy and successful.
But a chapter (two at the outside) is the right amount for me most of the time.
Someone who I think does these sort of things very well is Jim Butcher. They're often pretty bittersweet, which I think works very well as a outro chapter flavour. He'll answer a few of the big questions left unanswered from the beginning, he'll remind us of a few of the unanswered questions that arose during the book - I think every book needs a few unanswered questions at the end, even with stand alones - but the big thing he does is he really brings us into the characters' emotional world. There's some pretty heavy duty sledgehammers to the nads in his books and he milks it really well. It gives a real sense of closure to proceedings, and if readers have really brought into a book, that's what they're looking for - closure.
Good endings finish telling you what happened and tease you with what may have been (what was in that briefcase in Reservoir Dogs?)
Great endings leave you as emotional as 6AM on your best friend's stag do.