Assuming they don’t care about timestamps, you could include both the 3rd and the 16th, so long as you have some evidence of presence for those days (e.g. buy something giving your NIF).
Although per this thread 7 days during first year or 14 days during first two years? I’m still not sure if the requirements are:
years 1-2: 14 days
years 3-4: 14 days
years 5-6: 14 days
Or
year 1: 7 days
years 2-3: 14 days
years 45: 14 days
which are quite different requirements if you want to spend all 14 days in a row. E.g. according to the 2nd interpretation, 14 days in the first year would mean 7 are unnecessary and won’t count towards your years 2-3 requirement.