The two year limit is on the appropriation, not the Army
Yes of course, but I'm just surprised to hear you think the framers weren't against a standing army. I thought I'd remembered reading posts of yours where you cited some passages from the Federalist Papers and other writings of the framers which supported [how most on this forum interpret the 2A].
So I sort of assumed you'd have read their deep opposition to the existence of standing armies, and would therefore not maintain the interpretation you have.
So, there's a two year limit on appropriations. There are 3 possible reasons, imo, that a sane person could have for explaining that limit.
1) The framers intended that in the span of two years, enough money could be gathered to support a standing army for all eternity. Nobody believes this one, I hope.
2) The framers intended that the standing army be supported by money gathered in two-year chunks, and when that money ran out, another two-year chunk of fundraising would begin anew. We'll ignore the obvious flaw that the framers would never have overlooked, which is that if you only gather exactly enough to maintain the standing army in two years, then you are going to be in an eternal "raise money to support the standing army" loop, which is explicitly called out as the worst thing this side of hell in the writings of some of the framers. Worse, you raise less than enough to support the standing army in those two years, must go into debt, and you're still in the eternal "get money for the army" loop, even in peacetime?
3) The framers did not intend that a standing army ever exist, but knew that wars were part of reality, and provided a self-limited mechanism which would prevent the eternal loop of fundraising for the army, but still allow Congress to raise funds to fight wars, when necessary to defend the nation. You could raise money for two years, fight your war, if the war endured you could raise another round, etc, but when the war stopped, Congress would not get back on the 2 year treadmill, the money would therefore eventually run out, forcing the army to go away.