The B-17s would only average 6-8 days between missions: The Memphis Belle was the first heavy bomber to survive just 25 missions. But it took over 6 months to do that.
Today’s A10 or A6 or F15EX can drop more bombs at longer ranges, flying 3 missions a day, and getting over 60% hits per bomb! The B17s were only getting 10% of their bombs within 1/2 mile of the target.
A YouTuber named Lord Hardthrasher has an interesting channel where he analyses the WW2 strategic bombing campaigns. And he has some good ones on the falsehoods of Nazi technical superiority and how so much of their fear was shyt. Well worth checking out.