Question: how long does it take to migrate data from one mac to another?
Answer: It can take overnight mac to mac over wifi per Apple's support doc on migration Asst. I tried doing this with my 09 MBP to my new TB MBP but couldn't get them to connect following the step by step instructions. Instead I migrated from my time capsule and it went pretty fast. About 3.5 hrs for about 240GB transfer.