Question about Hal-Cash

[Grinder]

I'm going to Spain in a few months, and I intend to sell a few bitcoins to have some Euroes while I'm there. It seems to me that it would be very easy and convenient to do it through Hal-Cash (I'm getting a local sim). However, hardly any buyers here or on Localbitcoins seem to offer to pay using this method. Have I missed anything that makes using Hal-Cash a bad idea for trading bitcoins?

Also, does anyone know how long it takes before a Hal-Cash transfer expires?