Baby and Jetlag

How many days do you think the baby can cope up with jetlag and settled to the new environment after travelling? My friend doctor told me that it will take 15 minutes per day for the baby to cope up. It depends on the time difference of the country the baby came from minus the time zone of the country he is in now. So, if the baby came from the Philippines and come to United Kingdom with a time difference of 8 hours, let us say he will cope up 15 minutes per day, oh, dear, it will take for the poor baby to adjust to the new environment fully around a month. That is really tough! That goes on to say how travel can be travail at some point! But i also think it depends on the baby. Must be tougher with time difference of 12 hours as such countries like Canada and United States!