Zero.  BFL has nothing to burn in, ergo there can't be any hashrate from burn-in.

5. At the time I started working at Butterfly Labs, I was aware that the company had made statements to consumers that its bitcoin mining machines were tested on the bitcoin testnet, which meant that the machines would not produce any bitcoin value while being tested. From the time I started, I observed that the machines were not in fact tested on the testnet. Instead, I found that they were mining with the machines on the bitcoin network.

6. Butterfly Labs referred to the process of testing customer equipment by mining on the bitcoin network as the burn in of the machines because the first ASIC machines became very hot after being tested on the bitcoin network.

7. While I was employed, with the exception of a two-to-three-week period, all tested machines were set up to mine bitcoins in the Eclipse Mining Consortium (“EMC”). I believe that EMC was owned by Josh Zerlan. I was told by Mark Goodpasture at one point that the mined bitcoins generated by the burn in process would be put into a fund to benefit employees or charity. However, I later learned from discussions with Mark and other personnel that there was no such charity or employee fund. Instead, the burn in process was set up to mine bitcoins for the company’s benefit.

7. On or around April to May 2013, I started assisting another employee, Sam Johnston, in the “burn room.” The “burn room” is a large room that is set up to handle heavy amounts of power consumption in order to support large numbers of Bitcoin mining machines operating at the same time. During my time at Butterfly Labs, there were up to three burn rooms operating at one time. Depending on the room, there could be over 500 Bitcoin mining machines hooked up and actively mining Bitcoins at one time.

8. My job was to gather Bitcoin mining machines and to plug each mining machine into the “burn room.” Every single mining machine that we plugged into the burn room was intended for customers. I was told that the mining machines were placed in the “burn room” for testing purposes. But it is not necessary for the company to mine Bitcoins with the machines in order to test them. A closed system referred to as the “test net” was specifically designed as a means to test Bitcoin mining equipment without actually mining for Bitcoins. Butterfly Labs never used a “test-net” in the “burn rooms.”