How many I2C busses can I make on a Mega?
John_Pijnappel:
How many I2C busses can I make on a Mega?
How many I2C devices are there that you can operate using a single I2C Bus?
How many I2C busses can I make on a Mega?
One. You might try a software emulation if there is really a need for more but these have severe limitations.
Why are you asking? Describe your problem, we might have a better solution than adding another I2C bus.