Yes, just plan so that you finish a few years before retirement. Then you even have a time buffer.
I plan everything else as follows:
- after 10 years: check the special termination right. If interest rates are still low, terminate and sign a new contract.
- In case of rising interest rates: recognize it in time and set aside and invest more money. Make extra repayments in between or repay a larger sum at the end of the term.
- Build a sufficient maintenance reserve (new heating system, roof, etc.) and put the surplus towards repayment.
I have zero worries about any outstanding debt. I have only fixed a small part of about 80,000 for 10 years in the hope of getting to zero with the Baukindergeld and a little extra.