@Mike-700 will give you the answer on how long it takes for the heater to provide warm air for the E-power
My car is on a hard standing, not in a garage, so defrosting is a regular thing.
Two examples, both yesterday –
no 1. 0730 very heavy frost -5* c, got in eventually through frozen door, pressed start , then turned the heater control to high and Pressed both, the Defrost and heated rear window buttons, the fan was on max, and as soon as I did that, the engine started up.
It took a few minutes to feel any heat,but no longer than the Tiguan.
Later, at 0945 I went out again, +1*c no spray or scraping off, just started the car turned the fan up, and the engine started,, once again no longer than it took in the Tiguan to warm up.
Btw the engine runs a lot quieter than the diesel in the Tiguan
Just a note – at 1100 yesterday I drove 0.9 miles from the Gym to the shop & it recorded 99.1 mpg