Copenhagen for three days, Jutland for two weeks
A long weekend in Copenhagen, with maps, museum tickets and messages, fits in the 3 GB pack, which lasts 15 days. Install it at home and switch on data roaming for the eSIM when you land at Copenhagen Airport: you can look up the metro into the city while you wait for your bags.
Jutland is a different kind of trip. A family drive to Legoland in Billund, the beaches of the west coast and up to Skagen often means a week or two in a rented summer house, with tablets and a laptop hanging off one phone. If the house has no wifi, or you would rather not rely on it, 10 GB or 20 GB is the size that matches the stay, and both last 30 days. Between the two, the 5 GB pack covers a week of city and road.