Hi,
welcome and good luck everyone!
One word of warning when you diet for a holiday - this probably is true for any diet but even more so when you're doing Dukan. Taking the carbs out of your system means that the first time you allow yourself carbs in any quantities (and I am talking a couple of slices of bread max here), your body will think it's feeding time after famine and hang onto every single calorie it can extract from that *and more*. So right post-Cruise a piece of food that is say 100 calories will be absorbed like 120 cal. This is why it is so important to follow the 'Consolidation' phase of the diet to the letter, for the prescribed time which may well be coinciding with your holiday. Yes Conso it does allow some laxity (one nomral meal with drinks and one (lean) pasta meal a week)and the extra slice of bread and cheese and piece of fruit a day, but THAT IS really IT.
Maybe you already have read up on Conso, and are planning to do a holiday with some degree of self-discipline in the food department. But do have another look at the book before you interrupt your Dukan, and if you 'just let go' whilst on holiday then don't be too dismayed to see it all pile back on in just a week. Yes some, most of that will be 'water weight'' that comes back off as soon as oyu cut out the carbs again, but it's also quite stressful for your system to do these ups and down all the time.
Sorry this may have come out too negative, please don't let me put you off, any losses are good losses at any time and the Dukan strategies should see you through any holiday and allow you to make informed food choices. I just wanted to raise this point as both of you are dieting 'towards' a holiday. Also in terms of speed, after attack you should see your losses even out at about 2lb a week max.