Uploading the longest route - karoo 3

What is the longest route that can be uploaded to the hammerhead 3, so that it shows the route turn by turn? In the previous model it was possible to do this safely up to 500 km, of course it was possible to upload a longer track but the device only showed a map, there was no information when to turn. The new model has more memory, so maybe the problem has been solved, but has anyone tried to upload a track with a length close to 1000 km?