Loans aren't for indefinite periods of time (otherwise, the borrower would never have to pay back the money), and bonds are no different. (angryretailbanker.com)
b) Ind80S2T5.0 W smoothed means indefinite period with 80 % stocks, 2 % TIPS interest rate and 5.0 % of CURRENT BALANCE withdrawals. (early-retirement-planning-insights.com)
c) Ind80S2T6.0 W smoothed means indefinite period with 80 % stocks, 2 % TIPS interest rate and 6.0 % of CURRENT BALANCE withdrawals. (early-retirement-planning-insights.com)