If you wrote the check, the only way to guarantee that you will not be liable for it longer than six months is to place a stop payment order on it. According to Bankrate.com, an oral stop-payment order expires after 14 days and a written stop-payment order expires in six months.
Mb-a unit of information equal to 1000 kilobits or 10^6 (1,000,000) bits. Mbit, megabit. computer memory unit-a unit for measuring computer memory. kb, kbit, kilobit-a unit of information equal to 1000 bits. Gbit, gigabit, Gb-a unit of information equal to 1000 megabits or 10^9 (1,000,000,000) bits.
kb is kilobits and kB is kilobytes. While MB is megabytes, Mb refers to Megabits. 1 byte has 8 bits. File sizes are usually expressed in KB and MB whereas kb and Mb are often used to express data transfer speeds (such as a 54 Mbps wireless router or 3G or 4G connection speeds).B and kB refer to kilobyte-a unit of information or computer storage equal to either 1,024 bytes (2 10) or 1,000 bytes (10 3), depending on context.