So how long will it last?

The snow fell in a couple of hours on Saturday morning, a good 6 inches in two hours - quite a thing to see.

I took this photo last night and it looks the same tonight, the temperature did not get above freezing all day so I start to wonder how long we will keep the snow for. I do not remember anything like this before. And the forecast, currently more is expected.

So how long will it last?