How long should it stay at "erasing 'reserved 4' for? topic

I'm using the OFFICIAL OnePlus One tooklit (supplied by OPO themselves) to put my phone back to 100% Stock. All went well, but it "appears" to have stalled...possibly. (see pic)

How long should I leave it? It's been like that or around 15 minutes now.

Beginning to panic now.

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