Shoot, you'd have to take a 100, 200, or an even longer span of years just to get a decent trend. (wattsupwiththat.com)
It can be a lump sum amount, lump sum along with monthly, yearly or quarterly payment, or just the annuities spread over a long span of years as decided upon. (quickbima.com)
This means that your preparations must be flexible enough to cover a large span of years. (investopedia.com)