How long should it take to export a TM?

Hi there,

I'm trying to export a TM for a Wordfast user. The export wizard window has the message asking me to wait while the data is exported with the message 'Exported 0 translation units'.  The window stays like that for up to 15 minutes before I lose patience, which is perhaps the problem! So I'd like to know how long it should actually take to export a TM.

Looking forward to your replies,

KP