Totally depends on the frag. If I'm wearing Le Dix, I have to be VERY careful as it's a heavy hitter, a long-laster, and can have the effect of making people choke on the train. If I'm wearing something I love that I know is going to wear out very quickly, I use more, or take a small decant with me for a top-up. Agent Provocateur Eau Emotionelle never lasts long, and I don't currently have a decant of that one, so I just use loads. That one isn't a cloying frag, or one that hovers about much, so I can get away with spraying that on my clothes even, for a longer-lasting effect. Medium-longevity frags I just do spray a max of 5 times (behind ears, wrists, throat, and maybe down the cleavage! Ideally, I want to smell fab, but not to the point where people are going 'oh my god, what's that SMELL???' - y'know?