You can affect the drop rate by manipulating your luck attribute, but after that the message from on high is that each piece is truly random (i.e. none of your attributes affect which piece will drop)

The first pink floyd should take ~225 drops, though it may be lower, or much higher. So if you’re getting (say) 4 drops per visit, that would be 2 weeks of visits, plus or minus. If you continue farming, successive pink floyds will take less and less time, since you’ll have some of the parts already (down to a limit of one pink floyd completed for every 50 drops)

Since you can earn 250k+ per day from 4 visits, selling junk and doing jobs, you should be able to earn the amount of flezz necessary to buy a pink floyd in the same amount of time. By farming for it, you’ll be losing flezz due to lower deliveries and jobs, because you’re hitting just one forum, though if you continue to hit HOFF you’ll end up making flezz from selling pink floyds, provided there are enough buyers out there.