Reflux condenser sizing, cooling water consumption?

[Dr. Forrester]

Pardon, but I have two questions:

#1. What's an appropriate size condenser for a 1.5" x 36" Boka mini running at 1500w? Using the el cheapo refrigeration grade 1/4" tubing from the hardware store, unsure of the length needed.

After poking around the on the parent site's condenser calculator etc. it doesn't seem to give much guidance on sizing reflux condensers, or if it does I'm ignorant and missed it.

#2. This is dependent on #1's answer, and may be too subjective but how much cooling water will be required during a 20 liter run with this rig once equipped with a properly sized coil?

I'm trying to determine if a pump and reservoir would be necessary to keep that condenser working economically. I saw someone say their reflux rig consumes about 6 gallons of cooling water in two hours while running at 1900w, which seems like a drop in the bucket (sorry), but there was no mention of coil size or column diameter.

Thanks. I apologize if the answers to these are too obvious. I promise I google'd first.