Hi, and welcome to the boards!
1. Don't know and I don't want too and I REALLY don't want my wife to know! :scared:
2. According to my wife TOO MUCH, me not enough!
3. Probably to much, but I can sleep at night.
4. Quite a bit.
5. see #2
JMO! It really depends on the set-up you want to build. You can buy all new stuff w/ every gadget out there, spend tons of money, will you have success maybe? maybe not?..... If you look and are patient you may find a great deal on a used set-up that will meet your needs.
A new tank will require more time, an esatablished tank not so much. This hobby does take time no matter what.
A new tank will require more testing and then what ever your comfortable with, I test twice a week. PH, CAL, ALK, MAG, PO4, TRATES and SG. Always test waterchange water before it goes in the tank so all tolled 3 times.
I don't add water everyday b/c I drip Kalk for top off water. I go through my Kalk conatiner every 2-3 days. I lose a little less than a gallon a day in evap.
In the end I really don't add up time or money b/c this is a hobby/fun/relaxing and I don't need the added stress. I buy some new some used stuff and try and be as economical as possible without buying junk. I will say I spend more time watching than I do working on it!
HTH I'm sure your just more confused!
Tim