It is all relative, I suppose. I've had a Avios connecting flights calculator for a few years now and putting that together took a few days. This is mostly the same data which, admittedly, I do not maintain often enough, so from that perspective it was not too bad. I also recently made a similar map for <700 mile routes on United because there is a break on the price for booking those. I did that on Monday and someone asked on Tuesday if I could do similar for Avios. Since I already had much of the data it was a matter of putting the UI on top of it and I already had most of the code for that from other projects. So maybe an incremental 6-8 hours to get it done and look pretty.
I hadn't ever considered that someone might want to do something like that.

I'll see if I can come up with a means to make that happen.
I have the data to expand it so that is possible. I was concerned about the map becoming too cluttered and running out of colors to use for the icons. If folks think it would be better with the extra data I can add it in.

And thanks for noting DCA; I "fixed" it yesterday but apparently only halfway. Did the rest just now so it should be all good.

Yup. UI isn't my strong suit; I need to add a reset button or something.