https://infogalactic.com/info/Dormition_of_the_Mother_of_God
The Feast of the Dormition is preceded by a two-week fast, referred to as the Dormition Fast. From August 1 to August 14 (inclusive) Orthodox and Eastern Catholics fast from red meat, poultry, meat products, dairy products (eggs and milk products), fish, oil, and wine. The Dormition Fast is a stricter fast than either the Nativity Fast (Advent) or the Apostles’ Fast, with only wine and oil (but no fish) allowed on weekends.
Yes, excellent.
A general rule of thumb is that, if you miss a day, some people say that you make the day up at the end, while others say that you can do a hard fast until lunch the next day (no beverages, no food until lunch or even longer if you can).