Without BDB locks configuring, 0.3.20 gets to block 124,275, 0.4 and 0.4 to 258,354, and 0.6 and 0.7 to 364,670. With a high enough BDB locks settings, I was able to get 0.5 to tip after 2 weeks of syncing. I didn't try anything older all the way because I didn't have the patience to wait that long.
Good to see confirmation! and indeed, it's a brutal wait.
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I have seen people running newer clients on sub standard hardware / connections / configurations take that long and longer.
There are a few discussions about it. Along with the standard
'just because you can, does not mean you should' for some things.
But it is good to see that there is that much backward compatibility with this and that even years and years later it still works.
-Dave