Balde Runner 2049, which should be an equally technically challenging movie to make, began shooting in July 2016, wrapped next November and was released in October 2017, so it's a very similar production schedule to Dune Part II.
Also, Villeneuve is a director that released three big productions in three consecutive years;
2015 : Sicario
2016: Arrival
2017: Blade Runner 2049
So he's clearly a fairly fast director