How long does a lager barrel stay sell-able?!

Question: For pub retail, once opened, how long does the beer stay fresh for sale if its not all used.

---

---

Answers: For pub retail, once opened, how long does the beer stay fresh for sale if its not all used.

---

---

My wife works at Heineken and I've just asked her. She says the recommendation is to use the barrel up over 3 days but up to a week is OK

---

---

Upto a week but keep your lines clean!

---

---

---

---