The 6 month was meant as a maximum limit. I think 60 days are enough.
About deleting or closing: Closing is finer, but I don't know if it is worth the additional work is does (It sounds that that can't be done automatically). And I for my part would not search this forum to get information which company hires Qt programmers.

Don't know, I can live fine with both solutions.


@wysota: You work is not useless, I am sure you learned a lot while writing the cron job Non scholae sed vitae discimus! oh, how I hate that sentence...