Total Cost (brokerage) for any sort of Investment for MF

Yes it’s independent of time, there is no time limit within which you have to invest the 25k. You can invest it over 6 months if that is your investment plan. And the coin subscrciption fees is Rs.50+GST/every 30 days, whenever your investment amount exceeds 25k.

Payment gateway charges are fixed at Rs.9+GST every time you use the Atom gateway within Kite to transfer money to your trading account. Because this is a 3rd party payment gateway and these transfer charges are decided by them. You can skip these charges and do an IMPS/NEFT directly from your netbanking but charges may apply at your bank. Learn how you can create standing instructions from your bank account for your Coin SIPs.

Your Coin account is activated only when you have a Zerodha Demat account.