Not in Germany. The amount of vacation is based on the amount of days you work, not the hours. The goal is that everyone should be able to take at least a total of 4 weeks off per year. That means you get 20 days of vacation if you work a regular 5 day week. If you work a 6 day week, you get 24, but that is pretty unusual.
So, if you work fewer hours, that only matters for your vacation if those hours are also done across fewer days. If you only work 10 hours a week, but spread them across all five days, you still need 5 days to take an entire week off, so you still get the 20 days.
But anyway most employers will give you closer to 30 anyway, so the legal minimum usually only matters when it comes to things like transferring to the next year or paying out untaken vacation, because the rules differ there between mandatory and additional vacation days
Depends on the amount of hours.
In Belgium, if you work 40 hours instead of the regular 38 hours, you get 12 extra paid vacation days (ADV) on top of the 20 regular ones.
Not in Germany. The amount of vacation is based on the amount of days you work, not the hours. The goal is that everyone should be able to take at least a total of 4 weeks off per year. That means you get 20 days of vacation if you work a regular 5 day week. If you work a 6 day week, you get 24, but that is pretty unusual.
So, if you work fewer hours, that only matters for your vacation if those hours are also done across fewer days. If you only work 10 hours a week, but spread them across all five days, you still need 5 days to take an entire week off, so you still get the 20 days.
But anyway most employers will give you closer to 30 anyway, so the legal minimum usually only matters when it comes to things like transferring to the next year or paying out untaken vacation, because the rules differ there between mandatory and additional vacation days