I heard mei-ting learned Tango? and Feux-follet in 2 weeks ... should be around that, maybe a bit longer. Depends of your age too. When he was 14, took him 3 months to learn Gaspard de la nuit, and now he's like 22 or 23 ?
I find this very hard to believe. How can you explore every detail of great works in such a short amount of time.
Pieces you play in comepetion should done from memory, and should be absolutely effortless for you to play. Everything should be automatic, all your musical ideas solidly set. Then you can play it for competition or public peformances. Maybe it will take you 10 minutes or 10 years.