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DCA buying of Bitcoin can be done weekly or monthly, depends on the Cash flow of the investor. There are investors that received salaries pay every weekend while some investors will have to wait until month ending before receiving salary. The time duration here doesn't matter, rather the key thing is for them to be able to figure out a discretional income from their weekly or monthly salary to be able buy Bitcoin weekly or monthly. what you should also understand is that, an investor that is DCAng weekly and an Investor that DCA monthly doesn't have the same accumulation targets,their goals may be the same but their accumulation targets will always differs and cannot be the same. My points is ,an investor that's accumulating bitcoin consistent monthly may reached his Over-accumulation target faster than an investor that buys bitcoin weekly because of differences in accumulation targets.
Just like everyone's goals in life differs, same implies to Bitcoin investment, every investor can't have same target cause the amount they can generate for discretionary can't be same, for instance the target of a middle class salary earner and big whales like Blackrock or Saylor can never be same cause the amount those whales generate for discretionary is far more greater than what the middle class investor would generate. With that being said, every investor should invest according the amount of discretionary they can generate, yes the time duration for generating discretionary doesn't matter be it weekly or monthly so far the investor can be consistent regardless of time frame the discretionary is generated, the investor is good to go.
I need to clarify that an investor that is doing monthly DCA doesn't mean that he's accumulating more Bitcoin than who is doing weekly DCA. Again an investor that is on weekly DCA can have the same accumulation target as another investor that is on monthly DCA method. It doesn't matter if your income is dropping every two weeks or two months what matters is the amount that any of them can afford to buy Bitcoin with.
Your income and basic expenses determines how much you will have in your discretionary funds. From there you will use your discretion to know how much you can remove for your periodic DCA accumulation. Every investors are at liberty to choose any amount that they want for their DCA accumulation irrespective of how much they earn and whether it's weekly or monthly.