You're welcome to keep any amounts of funds in your Coinfloor account for the whole period of your activity.
You can keep your bitcoins in Coinfloor’s Vaults with no time limits until further notice. We release a Provable Solvency report every month proving the secure custodianship of all client bitcoins in 100% multi-signature cold storage held in underground vaults. Coinfloor is proud to have the longest standing track record among bitcoin exchanges in regards to auditing.
It is advised to withdraw your GBP and EUR funds within 30 consecutive days of inactivity to follow the AML guidelines.