That depends on how fast you draw them down. I've already given you a formula that calculates the draw-down rate that will maintain a constant income (in today's values) till age 90 - or whatever other age you care to nominate. Excel has other functions (eg PMT) that allow you to assume a given draw-down rate and see how long it'll take to exhaust the funds. It's time you started studying Excel's financial functions.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]