I am glad it worked out for you in importing the first file. I am still puzzled why it took that long.

For the new format, did you have Android or iOS? With the timeline export from Google Maps on iOS, we can not do anything at the moment because there is actually no raw data in it. Only information like you stayed in this timeframe at that point and you traveled between these points. It’s actually a little bit funny that it aggregates to the same data Reitti uses in the end.

If you are on Android, it could also be a bug when importing that file. I only had a small one from one of my accounts to test. If you mind creating a bug report, I will have a look. If you do not want to attach the export file there, feel free to send it to daniel@dedicatedcode.com. I will have a look at it then privately. No problem.

For the overlap in exports, it depends. If the points are the same, meaning they have the same timestamp, then Reitti will discard them. If not, they will be handled like every other new data and will end in recalculating visits and trips around that particular time.