Lent is 40 days and 40 nights so you will notice it does not include Sundays as they are always a celebration of the resurrection.
Abstaining from all meat on any friday is no longer essential in fact Pope John Paul 2 said we should be thinking of other things such as saying an extra prayer helping a person or maybe not smoking on a Friday
I like the Jewish idea of sabbath being from sunset to sunset. That way from sunset on a Saturday to sunset on Sunday in lent I can have a quick glass if red.