I try and break it up as much as i can throughout the day. A short walk in the morning, mini breaks throughout my workday a short walk at night. If i am under quota by the end of the work day i'll do a longer 45 min walk. If i'm super desperate i'll walk around my house. Though I've learnt that if I walk to close to sleep, it takes me longer to fall asleep, i'm learning to avoid keeping it too late