I've worked in consultancy for 15 years and let me share some wisdom with you.There seem to be two types of firms that operate in this sector (excluding 1 man bands and the like):a) Big ones, where you are a small cog in a big machine to be exploited and abused at every possible opportunity, and then replaced silently in the background without anybody even noticing once you've burnt out like a blackened fuse.b) Small ones, where they would exploit and abuse you if they could, but sadly they can't because even the tiniest little pleb like you is big enough within the company to be noticeable, and quite frankly they can't get away with it anyway because staff would leave for their better-paying and better-branded competitors if they did.Some partners/managers are simply toxic to work with. They will literally suck the life force out of you. If it benefits them by even 0.00000000001%, they will quite happily make you work an extra 30 hours on top of your existing 80 hour week. Usually this kind of crap happens when you really need to take your foot off the gas pedal a bit at work, e.g. marriage, family problems, moving house, legal problems, etc. It's almost like these sadists have a sixth sense and thrive on making things difficult for you.Then you have the insecure principals/senior associates. These are the ones who are desperate to "make partner" (even though most never will) so they don't just go the extra mile, they go the extra light-year. And so does their team. As the people who have the most influence over your annual review, they have the ability to give you grief of unbelievable proportions. Which in turn means you don't get any evenings and end up stressed out over weekends.As for the associates and mid-level guys? Well, they're pretty much in the same pot as you. Except these guys maybe need the money a little more or have more at stake, so they just bend over and take it, albeit a little more enthusiastically than the rest of you. The result? You end up having to fake their level of enthusiasm, and in the words of Shakespare, "A rose by any other name would smell as sweet". Except you get paid about half of what they do.So now what about all you little grunts right down there at the bottom of the food chain? Easily replacable, no internal network, working with people who have big egos and/or want to exploit you? A recipe for disaster (for you). At least in a small firm some of these factors are more limited so you can push back a little and try to make things manageable. Like 50 hour weeks instead of 70.