I hate choc tetras out of the carton. I find them reaally rich!
I have froze one... and I left mine in the freezer overnight. I have also had one sitting in there for about 5 days now... I shouldn think it really matters... I think I'd use it within a week or so though! (So I dont forget about it)
I cut mine out of the box... before I put it in the freezer I opened out the flaps on the top of the carton to leave a little extra space in the carton so it could expand (if needed), but also so I could get in!
When I opened the carton I popped it into a bowl... i kinda chipped at it and ate it all in tiny mouthfuls... took about 1/2 hour... but tasted sooooo much nicer than when u drink it!
A bit like chocolate ice cream (but more like sorbet)
If you left it on the side for a little bit I'm sure it would be easier to eat... (I was too impatient)
Overall verdict: Yummy!
