The summary question at the end is NOT a good question. Are you planning to study LSAT for the next 10 years?
Data suggests that the "practice test sweet spot" is between 6-14 tests.
That doesn't mean you wouldn't do a crap ton of other LSAT questions / 35 minute sections.
But it means that you should only plan to sit down for 4 hrs at a time around 10 times. Generally speaking, once every three weeks is good when you're starting out.
More than 6 weeks away: take a test every 3 weeks
6-3 weeks away: take a test every week
Last 3 weeks: take 2 tests per week (if your schedule allows, otherwise one per week is fine)
Older tests have plenty of value. Anything from 60-81 is a pretty good facsimile of a "modern test". Anything from 40-60 is still 90% similar in vibe. Your score on an older test is going to only be a couple points different from how you'd score on a modern test.
Older tests are great for the early learning process because our goal is to master things on a simpler level before we add nuance and misdirection. Older tests are not EASY by any means, but some of the classic flaws and classic moves are less disguised. Games sections don't have the annoying 1 or 2 Rule Equivalency questions. And RC correct answers are better supported by text across the board.
For the ten or so full length practice tests you take, consider doing something like 62, 64, 66, 68, 70, 72, 74, 76, 78, 80
Then you can use modern odd-numbered tests for individual 35 min sections here and there.
You don't need to do every logic game out there if you reach a point of acing Games sections in 35 minutes, but until then, yeah go ahead and try as many games as you can process.
The key caveat: you should be in the habit of doing the same game a 2nd and 3rd time.
If it's a really hard game for you, the 2nd time could be 3-5 days later.
If it's easier, the 2nd time should probably be a week later.
The 3rd time would usually be 10-20 days after the 2nd time (if you still have study days left on the calendar).
In that sense, it becomes harder to get through all 80 games sections, since doing them 2 or 3 times each means that instead of talking about 320 games, you're talking about 600-900 games.