This goal is for players who have only just freed Thurston and have his fort. This means that you won't have nuggets in store like a level 50 player. Don't be discouraged! And don't think about using gems!! sir Daisy's isn't going anywhere.
Yes this goal may take many months for the lower levelled players or for those that use their golden items for the gem royal exchange trades or if you don't permanently have your device attached to your hands! lol. Finishing this goal can't be a pre-requisite for any of the current story lines, so TAKE YOUR TIME!
Congrats on getting the barracks too! Slow and steady is just as good as speedy Gonzales! Be encouraged!!