It's kind of a difficult question to ask since first, we understand florins to be a continuously fluctuating currency used in that time period, the changing values of which the Medici famously leveraged to amass their great wealth while dodging usury condemnations. That, and the florin was an excessively valuable coin even in its early minting days, as it was 58 grains of gold. The florin was so valuable that the government even issued "sealed florins" (florino di suggello) which were florins that were traded in leather bags to prevent depreciation from chipping. Because this coinage is so high in value, they don't translate well to everyday living. I think it's safe to say the poorer citizenry of Florence may never own an actual florin in their life during the time period. Second, the government had actually issued multiple types of florins over their lifetime, including a larger form of the florin that contained ten-per-cent more gold than the sealed version, but for some reason rose to be worth twenty percent more. The point is we're dealing with a lot of different numbers here that are rapidly changing. Imagine in five hundred years if you'd asked what the value of a Venezuelan Bolivar to a US Dollar was, right?

But to put things in perspective as best we can, a florin was worth about three and a half lire at the beginning of the 1400s, and had risen to be worth seven lire by the 1500s when we were discussing. Lire were silver coinage divided into 20 Soldi which were divided into 12 denari. In 1456, the painter Neri di Bicci paid his baker two and a half lire for a year's worth of bread baking services to his household, which was in excess of seven people. In 1465, this contract's value had risen to 5 lire, or about a florin at the time. For relatively low-skilled labor, we can understand a florin, then, to be more in the realm of several months to year's worth of pay. I don't know if Neri di Biccci's baker had multiple contracts, worked out of a workshop with apprentices or not, but we can at least estimate a florin by the 1500s to at least cover the salary of partial work for a regular person for an entire year. A bit like organizing maid services for yourself. On the other hand, a florin could also gain the attention of the most highly-skilled people in the city for about a day. In 1444, Francesco di Matteo Castellani paid 4 and a half or so Lire to be cured by a master physician which if we remember is about a florin.^1

Now, this is the 1500s, so a florin is seven lire by now. And seven lire could hire the services of labor like a baker for a year, or highly skilled guilded masters for about a day. So if you multiply that by three thousand... 3200 florins is an enormous amount of money to be paid at the time. It could purchase you a villa, about. Though you must remember that it was back-breaking work for Michelangelo for about four years of his life, and the so-called "Warrior Pope" at the time could be quite flippant and infrequent with his payments to Michelangelo as Julius was busy fighting his wars, that doing this work pulled Michelangelo away from his intended Magnum Opus, the Tomb of Julius II, and that Michelangelo had been successfully sued by a recently widowed mother-in-law who "betrayed" his family by successfully suing for her dowry back (which meant Michelangelo no longer had any claim to inherit from his recently deceased Uncle Francesco's estate). These grievances would come to a head when Michelangelo stomped off to Florence and the Pope then summoned him in anger, causing Michelangelo to sheepishly arrive in the recently conquered Bologna, where Julius II then commissioned him to smith a bronze of him which took another two years of the artist's life.

1- Images and Identity in Fifteenth-century Florence, Patricia Lee Rubin