That's right. So use a continuous x-axis instead if you want to show hours and minutes. If showing averages (or totals) per day is good enough, split the datetime field into a date and a time field and generate the missing dates for the date field.
if you absolutely want to show all your data in the chart (like option 2 'Nor using the continuous scale would be also fine when not the x scroll bar.'), that should be possible.
See attached for a sample with 10000 data points. Of course you would need to 'zoom in' (i.e. select a sub-range of data) to see the datapoints in detail, i.e. there is a loss of information in this view.
I've been struggling with this and was happy to find a solution - but I can't get it to work! I've downloaded the document and tried to make a similar chart as the one already there - but my version does NOT display all values. What am I doing wrong? How did you guys manage to get it to show all values?