DH's works in a different State than we live. His State goes by minutes instead of days. So they go an extra hour or so every day but less days. It works out to 160 days. In the State we live in you have to go 180 days no matter how long you go each day. So if I want to have all the same breaks he does and finish at the same time he does, then I need to start 20 days before he does.