They would have to create almost 120,000 votes to flip Florida.
FLORIDA ELECTION RESULTS
(showing Trump & Clinton only)
Trump - 29 Electoral votes
4,605,515 votes
49.1%
Clinton - 0 Electoral votes
4,485,745 votes
47.8%
I think you only need to flip 60,000 votes which is half. You would need to manufacture 120,000 votes. Flipping has 2X the impact. One less for Trump and one more for Hillary is a total of 2.
A lot of people are missing the point of the recounts. You add votes if you can hoping to get enough for a recount at which time you flip votes. The same is true for PA. The goal is to flip PA not remove it.