How does ECON-I decide what to use for days to dry off

How ECON\ calculates the dry off date

The following priority is used :

1. The item specified in the command itself, eg

ECON\I DUDRY

1. Else, it looks for an item called DUDRY.
2. If still no luck, it looks for an item called DRYOF.
3. At this point it gets desperate. It scours the item table looking for a type 50 item with CDAT as Op1 and an Op2 > 170.
4. If none, it looks for an item with type 61, Op1 is "DUE" and Op2 is between 29 and 89. Like I said, this is desperation.
5. If still stuck, it says the hell with it, and uses 60.