Well that's definitely too long. I even think it might be a failed trade as shapeshift conversions are usually fast and I heard in blockchain.info conversion are in "precise" mode so there should be a time limit per session but I'm not sure since that feature isn't available in my country although I've used the regular shapeshift.

Example of a failed trade: https://i.imgur.com/5kb4fAG.png

Anyways, What I've said earlier about contacting their support is still valid as only them can help you in this and provide you some details on what really happened. Don't forget to follow it up on their social media sites. Try to make your support ticket detailed and followed by proofs e.g. screenshots, Order ID, TXID etc.