I took about five days off after having the outline of mine done, and then about the same again after the first lot of colour (it needs more), but that was more because it's quite large and right down my right side including my midriff, so I didn't want punters lying on it or rubbing against it. It's stingy (like a bad sunburn) for a couple of days but it's an open wound and whilst the initial healing over is fairly quick it's a while before it's fully sorted.
Without derailing the thread, I wouldn't and didn't put either plastic or antibiotic ointment anywhere near any of mine and from both experience and on very good advice I wouldn't recommend it. Be careful of things like clothes rubbing against it too - I couldn't wear a waspie or anything more than a loose/soft suspender belt and even if you don't tend to bother with stuff like that, things like bra back straps or jeans waistbands can make a mess of them
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Edit: front of thigh, I'd agree about a week - it's somewhere that might get touched with germy hands and it'll be sore if somebody scrapes it with clothes or anything
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