My understanding is that 1 acre can be planted, cared for, and harvested in about 10 hours a week. This assumes the CSA would not be making deliveries. An acre is ~30 shares -- food for roughly 100-150 adults.
Most CSAs grow food for considerably more people, are substantially larger than an acre, and may make deliveries, or raise crops to sell on the open market as well as sell shares, and this of course may necessitate multiple full-time workers.
Most CSAs grow food for considerably more people, are substantially larger than an acre, and may make deliveries, or raise crops to sell on the open market as well as sell shares, and this of course may necessitate multiple full-time workers.
That's my understanding anyway, rough as it is.