Hi mate, welcome to the forum.
The manufacturer 0-60 for a manual GTI is 6.9. I believe a DSG is always around 0.2 seconds faster according to VW so you are looking around 6.7 for a DSG car.
HOWEVER!
If you are looking on the internet then you may find figures as low as 6.0 seconds dead or as high as 7.2 seconds. There can be a huge variation. This is because there are too many variables. Road surface, fuel, tires (both make and pressure) (even maybe wheel size), weather conditions, weight of car (taking into account options and fuel and passengers) all affect the performance.
The biggest reason for variable however is the fact that most people go by their speedo.
I can almost guarantee you that you will get a faster time if you time it with your phone and your speedo but it's just not accurate.
If you want to get your time look at some sort of timing gear. There will be loads of advice on here about it.
Hope that helps