It's difficult to say exactly how much Bitcoin can be mined in a single day, as it depends on a number of factors such as the hash rate of the mining equipment being used, the difficulty of the mining process, and the current price of Bitcoin. However, it's generally understood that the amount of Bitcoin that can be mined in a day is limited by the number of blocks that can be mined in that time period, which is 144 blocks per day. Each block contains a reward of 6.25 BTC, so in theory, the total amount of Bitcoin that can be mined in a single day is 144 * 6.25 BTC = 900 BTC. However, this is a theoretical maximum and the actual amount of Bitcoin that can be mined in a day will be lower due to competition among miners and the increasing difficulty of the mining process.