Just got my Edge 1050: will it ever complete the first update? Can't interrupt it neither.

First thing first, after having paired to my phone's Garmin Connect Mobile via bluetooth, I connected it via cable to my MacBook and run the update via Garmin Express. It said it had to update maps, so as an IT person I thought that the cable was the preferable way and I went on. Now the update Time Remaining it's keeping increasing after having it connected 1h ago: it now say it'll complete in almost 15 hours, but still increasing as I write. Problem is that I can't interrupt the update process neither because it says it's gone too far by now. So am I stuck? It says it won't complete before my ride tomorrow morning!