Nice. Are you missing some data points on the 10th day though? Also, that +340 in the formula looks to me like the line should end up vertically shifted, and yet it appears to go through the zero point, and the data points look in the right place (if you assume that 1 hour represents 0.05 of a day for at least the first few points I checked).
The data is stitched together from various different people's datasets, with differing resolutions, hence the patchiness.
What zero point? The zero on the time axis is an infinite distance to your left!
The fit-line does pass through [1day, 340orders]