How long does it take for the fluid in my surgical drain to go from red to clear?

I had an open ventral hernia repair with laparoscopic mesh placement seven days ago. the fluid draining into my jackson-pratt is dark red. my surgeon told me it would eventually turn clear-ish pink, and I'm wondering WHEN. I understand how drains work, I'm just wondering if I'm oozing somewhere. is it normal for my fluid to remain dark red seven days post-op, and when to expect the color change to clear fluid.