One of the most challenging aspects of saving for retirement is trying to figure out how much money to sock away. And since it's pretty much impossible to predict how long your retirement will last, it can be really tough to narrow down your ideal number.

Many people will say that $1 million should be enough to make for a comfortable retirement. When I first started building my nest egg, I, too, assumed that saving $1 million would put me in a pretty good spot.

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Source Fool.com