I'd suggest to wait as long as you can to around 12 months or 10k km in that time car should have shown any warranty issues.
In saying that I only lasted about 6 months and 5k km on my Mk7 R back in 2014 before going APR stage 1. I'm now stage 2 HO and 4yrs and almost 50k km down. I have had water pump go at about 40k km mark out of warranty and was about $1500 repair. I think that is less likely with upgraded water pumps in the 7.5 R and newer revision turbo's less likely to fail also.
I'd say with good maintenance and common sense driving you shouldn't have any issues at all but also be prepared in that 1/100 chance you get turbo failure, haldex/water pump issue then your looking at $1500+ repairs.
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