....It doesn't matter if it's an Ed30 or an original GTI, you can remap after running in a good 1,500 miles but the good established custom tuners I spoke to all privately/unofficially recommended that 10k miles was much more sensible. It's up to you of course but I would let the engine settle and loosen up properly. It also helps if you aren't remapped if you have any warranty issues - Such engine issues are more likely to occur earlier in the engine's mileage.
There are also advantages to remapping
after hardware engine performance mods such as exhaust and intake.
But I'm an older buck who has learnt how to take my time (particularly addressing any ladies lurking here

- Dinx?)
