Yeah, this just depends on so many factors it's impossible to give just one answer. The main variable is surely how experienced the player behind the starting bankroll is; with a direct experience to bankroll-size correlation.. [emoji1]
The he-who-shall-not-be-named poker pro did a $0-$10,000 challenge once upon a time, I read that after some extensive initial difficulty during freeroll stages he eventually managed it after something like 9 months.. Of course he was already an established pro before the undertaking, which might explain why it's taking me somewhat longer, haha.. [emoji1]
That being said, I did satellite into the WCOOP by finishing 84th out of over 36,000 and am playing in the 250k gtd today so hopefully this tourney will be the breakthrough after three years of perseverance!