I have a 50 ml bottle of it that I bought last August. I have worn it maybe 10 times (I have a lot of perfume and save this one for big nights, etc.) It's certainly not an office or gym scent! It's extremely rich and deep and long-lasting. When I go out I carry a little decant with me and re-apply once after 3 hours or so. (Not really necessary, but I like having the experience.) It's always there in the morning and will last through the day if I don't wash it off.
I was tempted, too, by the big bottle -- it seemed like such a good (relatively speaking) deal. But I just couldn't bring myself to pay well over $300, with tax, for a perfume, however gorgeous. My 50 ml bottle has only gone down maybe 1/16" in all this time.
So, unless you are going out to a ball every night, consider staying with the smaller bottle. And keep it in the dark. Any perfume can go "off" if exposed to too much light.