In how many years of account inactivity ("unspent transaction output," in the case of Bitcoin) do you think it is OK to wipe out someone's money?

- 1 year?
- 5 years?
- 10 years?
- 20 years?
- 50 years?
- 100 years?
- 200 years?
- 500 years?
- "IT IS NEVER OK!"
- Other?

As a reference, in some countries in the "real world," if you don't make a transaction on your checking account for 3 years, your money can be taken away (in Australia it was 7 years and they reduced it to 3).

It's for a Bitcoin fork that I'm developing where there's not a hard limit on coins. The block reward is to be the primary source of coins (1:1 on hashrate, forever) and the main sink is an ~1% depreciation on every coin per month, plus I'm think about adding an "abandoned coin" heuristic to be able to wipe out outputs that go too long unspent, hence this poll.

Thanks!
Obey