Bhai im not sure if its 5-10 i just made a wild gues.
In 2005 when we bought a Baleno , Baleno CNG had 60k premium and 3 months delivery,
Baleno petrol had 1 month delivery, 10-20k Premium, we paid 12k premium.
So its a wild guess, but paying 10k for 10 days isnt justified, like Rs1000 a day, thats freaking too much.