I know it's insane and I even do not need it.
I have been using this HDFC CC for 8 years now, Regalia since last 5 years.
This limit is not uplifted in a day or so it has slowly increased and I kept getting prompts to increase my limit but I did not, so you see the difference in existing limit and proposed limit.
I did have a Preferred account/converted from salary account for some 6 years and of late just trying Imperia.