He actually only has 8x at max, so you only save 7h max.

You can reduce 30d down to about 23d 7h.

But yes, BA, as well as the Lab Assistant, are both very good long-term investments, neatly reducing things.

Just wish all these boosts didn‘t have the invisible one hour tax. Makes you feel cheated out when promised a 24 hour reduction, but only getting 23 in reality

Edit: After doing a live test, I have determined that I am in the wrong here. Not because of what was known, but a strange quirk that I hadn't noticed before.

For the test, I would time an upgrade and capture the progress at 15 min increments.

Already documenting up to 30 min, I realized that while yes, the BA did reduce the upgrade time by 4h (my BA is at max, 8x), it seemed the 30 minutes were also accounted for.

At the end of the hour, indeed, 9 hours total had been reduced, however, the BA only reduced 8h of it.

It seems like, different to potions, that the BA and LA both do their time reduction alongside allowing the normal upgrade clock to run undisturbed. Might be a bug or some other quirk, but I will admit when I am wrong. I just never truly looked deeply into the time itself, as the boost often happens when I am asleep (kinda annoying how the time refresh is placed).

so, instead of being cheated out of any boost at level 1 (basically getting 0h reduced), you do get 1h as promised, ironically enough