It depends on whether you've ever made a game before, whether you have money, time, resources or a team, or any one of other many things it takes to make this happen.
It really depends on the skill level of your artists and programmers, the clarity of your design document, and what resources you have available. If this is a full time job for everyone, it will go faster than if it's an "on the side" evenings and weekends job.
Also, if you have previous game development experience it will go faster. If you don't, it will go slower. If you have a reliable team, it will go faster. If your team is not reliable, it will go slower.
Perhaps others can fill in more dependencies in the comments.
If you REALLY stick to making a clone and not changing the game, it will go faster. If you start making changes and tweaking, it may take longer.
To the point about the original game you're cloning...
Probably a lot of what went into that original 4 years of development time was design, trial and error, prototyping and polishing the idea. If you're going to just copy them, clearly you don't need to spend time on thinking much - just coding and art.
And lastly for some advice from the mouths of pros who've cloned other games..
You might find this article interesting. It's about how Farmville was created in 5 weeks. It was a clone of various games and so the developers didn't need to come up with a completely original idea.