What is the cost for data migration?

Data migration costs $150 per hour. NAT file only migration is the quickest however the data is limited to AVETMISS data only. The time required for migration depends on the amount of date (years) and things like file attachments.

How long does migration take?

It depends on the size and amount of data. Generally we can do migrations within 2-6 weeks start to finish.  You can continue to work in your account during the process.