There are 3 sets of people who do Ironmans. The first is people who want to complete an IM as a one off, once in a lifetime achievement. This is probably the biggest group of triathletes, Lots of people like this on Ironman Journey Facebook pages, however, not too many here. The basic requirement from these people is to complete an Ironman under the cutoff time. The biggest challenge is that many have very little or no swimming experience.
The next group, which I am certainly a member of, is the over ambitious “I’m going to qualify for Kona first time out”. Lots of smashing it in early training, lots of injuries. A respectable, but unspectacular first Ironman, and certainly a few hours slower than Kona Qualifying. After a couple of years trying to bludgeon a route to Kona, these athletes realise that it actually takes a few years of consistent training to build up a sufficient base. In the long term, it doesn’t matter if you have a 2 week holiday, miss a few sessions due to injury of sickness. For people like me, life has to fit around training and racing
The final group, who are a bit tricky for me to understand, are the ones who do multiple Ironmans just for the sake of doing them. Usually just one IM per year (or less frequently). These people have a great long term base fitness, so training is incorporated into life. In reality they could probably do a perfectly good Ironman with 3 or 4 hours training per week. There a quite a few people like this here and they probably have the best advice
Whatever group you fit into, 2 weeks missed training and time off running due to injury won’t make a big difference. If you are in the first group, unless you have massive swimming deficiency, or have really low level of base fitness, then completing an IM in under the cut off is really not that hard, even if you have to walk the entire marathon. Given what you told us, sounds like you have decent fitness and can swim. If you are in the second group, you will be stressed that lack of training and holiday will prevent you getting to Kona… well you weren’t going to get there on your first one anyway, so you may be 15 mins slower, so what. If you are in the final group, you’re fit, you can swim, you can train 7 hours a week, cutoff times aren’t going to be an issue, so don’t get stressed, enjoy the vacation. recover fully from injury before you run again and enjoy it.