That is incorrect. It is 5 calendar days. Monday 19th is the last day. If no filing expect the dreaded "E" by Thursday as it usually takes 2 business days for the OTCBB to admin the "E".
However, the OTCBB is usually lenient and lets you slide a day. so filing by Tuesday is still OK
"You can't be a real country unless you have a beer and an airline - it helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer". F Zappa