[Error9632]

The 7-10 times seems quite off. It’s pretty close to 5 times assuming common extraction yields about 20%. So instead of brewing 16g of coffee you could dissolve 3.2g of instant.

[maxbond]

For what it's worth I just checked my store brand instant, and the serving suggestion is 1.9 grams.

[Error9632]

All depends on the concentration you are trying to achieve. If you brew 16g of coffee, you'd usually end up with around 260g of finished brew.