Simply put, EVERY 1ml of your nolva research chemical contains 20mg. You have 60 1ml 20mg doses in your research chem container.
So under your PCT protocol, you would take 1ml every day for the first 2 weeks, and then 0.5ml every day for the next 2 weeks.
That being said, the PCT plan you posted is different from what is generally recommended in this forum. The generally recommended PCT plan is 40/40/20/20. You have enough nolva to carry out this plan. I have used the same and have recovered fine with it.
Alternatively, the following PCT plan has also been recommended:
Hope this helps.