Twelve years ago, Mr. Lawton rolled a $17,000 retiring allowance into an RRSP that subsequently earned 10%

Question:

Twelve years ago, Mr. Lawton rolled a $17,000 retiring allowance into an RRSP that subsequently earned 10% compounded semiannually. Three years ago he transferred the funds to an RRIF. Since then, he has been withdrawing $1000 at the end of each quarter. If the RRIF earns 8% compounded quarterly, how much longer can the withdrawals continue?