The radishes were among the first to germinate. In fact, they showed up on Day 3 along with the marigolds.
So, it took 32 days from sowing the seeds to when we ate the first radish. Next time I plant radishes, I will follow fellow gardeners' recommendation to sow a row each week...that way, they don't all ripen at the same time. (UPDATE: THAT ROW OF RADISHES IS ACTUALLY ARUGULA)
Yay to organic, raised bed gardening in South Florida!!!