If you ask me, it's more about use about 10% of monthly salary to DCA, then save the rest. Because if we are lucky, and a golden opportunity comes again - it might be a good time to be irresponsible and use up to 90% of your savings to buy the DIP.
Using 10% of monthly salary by salary earners is not a bad idea, I consider this one of the best approach when it comes to DCA, cause one would still have reserve funds as a leverage to take advantage of the market when their's a massive dip for instance about weeks ago when Bitcoin fell below $50k. This is the more reason why it's advised that people shouldn't loan money to go into Cryptocurrency, imagine if someone made entry with a loaned money at $60k plus and the market declined below $50k they'll end up being in a big mess cause I wonder how they'll pay off the debt, investing on Bitcoin especially when someone is using the DCA method is meant for those who got a stable income and not some jobless person trying to alleviate themselves with the little funds they got through Bitcoin.