Simplify the following text for a Grade 8 native English-speaking person.
Original: The duration of lactation is about 200 days , and the young leave the burrow between 180 and 240 days .
Simplified: The duration of lactation is about 200 days , and the young leave the burrow after 180 to 205 days , usually in January or February , at which time they are around 800 a. There is no contact between the mother and young after this point .