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Operation "dig up as many heroes as possible until you're exhausted" is done without the help of Hero Digger.
So, the first 100-120 heroes are dug up with almost no repetitions.
Then, about 30 heroes are dug up, skipping one after another.
And you'll have to put in a little more effort to find the remaining ten or so heroes.
But all of this is done without the help of Hero Digger, 2 hours max.
If I didn't know what this was, I would say IronAxe - go for it. But the harsh truth is that after 40-50 heroes, the tavern starts showing the faces of the heroes you've already dug up, plus you lose concentration, and something starts to feel off... And you also need to keep a "hero digging log," so to speak, for the sake of order. Moreover, some heroes just don't want to appear, even though they're not used anywhere. I understand that you're relying on personal experience, but we're not amateurs either - 3.5-4 hours, no less. I doubt anyone will want to repeat such feats, but as they say, the ends justify the means.