Hi,
A leased line of 64 kilobit per second can carry 64/8 kilobytes per second for bytes consisting of 8 bits. Therefore, a file of 200MB data will take 200,000/8/60/60 hours i.e. about 7 hours. However, please keep in mind that a leased line of 64kb/s never delivers true 64k, so you should put some margin for that
Thanks
Anwer Jalil