Are "Thread" options expiring ok?

Hey all, before I enable it for "Expire in "x" days" for thread options. (Like bold thread, color etc)

Anyone have 1st hand data if its working stable or so or is there some in there that dont expire correctly. Thanks. =)

[gooberface]

Also, does anybody know what number to place in there so that the item NEVER expires? Would we use a zero, or a 99999999, or what?

[Mysticales]

Its just a 0