How much LG for weft install?

Hello, well I'm finally planning to do my first DIY install tomorrow!  I'm using bohyme and liquid gold with the sandwich method, and I'm doing it with a syringe... 

I have 2 of the 1/2oz bottles of the LG but I suddenly feel worried this won't be enough .  How many bottles do people generally use for one weft install?

Thankyou x

Emily....I could kick myself in the butt...I purposely paid attention with my last install to how much LG I used, and now I forgot. I think I usually go through about 2 or 3 small bottles. But I usually only use about 2/3 to 3/4 of each bottle before it starts getting too thick and gooey, and I set it aside and open a new bottle. (I put the unfinshed bottles aside and use them later for doing pretipps, so its really not a waste)

So if you are going to use a syringe you may be able to use up the entire bottle of LG without it getting too thick.