1 Week is seriously too short and I don't think it will be sufficient, as this trip is to have the time team to come over to get brief and catch up with news and progression up till now.
On the other hand, I wanted the team to be here and be adaptive to the process flow structure as much as possible, factor in the handicap in language, 2 weeks is just right and I would suggest if needed then maybe we can arrange to extend for another week.
Then in total we should have 2 + 1 week time.