Rimuru is building a dungeon in preparation for the upcoming festival. It will feature treasure chests containing weapons made by Kurobe, and Veldora will inhabit the deepest floor as the final boss. Then Milim suddenly shows up with a suggestion...
I'd expect something like this 
to take a few years to build.
أتوقّع أن يستغرق شيئاً كهذا
بضع سنوات لبنائه
Ich würde eher davon ausgehen,
dass das mehrere Jahre benötigt.
Considere que tomará años terminarlo.
Considere que llevará años terminarlo.
Il faudra des années
pour les construire.
Per un progetto simile, sarebbe
più saggio calcolare un annetto buono...
É melhor considerar que levaria
alguns anos para construir.
На проекты такого масштаба
точно несколько лет уйдёт!