Average life span of a poiston dart frog is about 3 weeks. So generations are about two weeks apart. Call it 25 generations per year.
According to current scientific theory frogs developed out of lungfish about 375 million years ago. So, call that the proto-frog. To get to the blue poison dart frog discussed in the article, and assuming other frog ancestors had similar life-spans you end up with:
25 (generations/year) X 35,000,000 (years) = 875 million generations for the features seen now to have evolved.
It's 25 (gens per year) X 375 million years = 9.375 BILLION generations for frog evolution to go from early proto-frog to modern blue poison dart frog.
—” 875 million generations for the features seen now to have evolved.”
Far beyond any ciphering that I might understand, guessing that it is not a linear path.
Many dead ends on the evolutionary map.
Any number of generations do not equal an advance, some will be retrograde, and some no change...
And the roving gangs of biologists searching for Darwin statues to destroy and avenge the besmerched pepper moth.