I do 6 for ag valuation (land tax reduction). Getting set up for 6 was quite a bit of time up front - perhaps 30-40 hours.
Now not a big deal. If you are ok potentially losing a couple of hives per year ($250/each to replace or catch a swarm if you want, or split one if your other hives are strong enough) then not much time at all. Hour a week during summer or so, nothing nov-Feb except doing a bit of equipment/hive body and frame maintenance.
I “bought in” so spent quite a bit up front. $300/nice suit, $100 in misc supplies (smoker, hive tools, frame rest). Each hive is $250 or so ($150 basic plus $100 for an extra deep). “Supers” for honey are around $50 -75. All that is per hive, store bought, and including the foundations. So x6 was a bit the first year but saved $3500 in taxes so all is good.
I get 4-6gallons (around 60 lbs total) per year harvesting from 3-5 hives. Don’t take any the first year of a new colony and I lose 1-2 per year. We also suffered from excess rain 2 years ago and extremely drought last year so I have no idea how much I might get. And I don’t try too hard plus in Texas we only get one harvest per year (July) due to drought/dearth and “snow on the prairie” polluting the fall harvest