How long do MMR side-effects last?

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DD (14 months) had her MMR exactly 10 days ago. She seems to have the classic side-effect symptoms the nurse/leaflet mentioned - mild fever (on and off) and lack of appetite.

I'm not particularly worried about this, but it's been going on for a couple of days now. How long do these symptoms usually last? Should I be worrying that she's going down with something else?

My DD wasn't herself for a good three weeks or so afterwards and had me worrying. She was absolutely fine after that though.

My dd1 got a v. high fever for about 3 days with hers. Dd2 sailed through it. Ds had his three weeks ago and we've had peculiar naps and some terribly bad nights but o/wise he's fine. Am expecting in a week or so he'll be back to normal.

Thanks for these answers. Looks like I shouldn't be worrying then. She's actually much perkier this morning so maybe the worst is over (not that it was particularly bad!)