L2 Visa. How long do you need to be married?

[BMCL]

After a 15 yrs I will be marrying my partner, this has coincided with an opportunity to transfer to the USA with my company on a L1b visa.

My question is, is there any predefined period of time that a couple most be married before applying for an L2 visa?

Thanks

[kabkaba]

No.