It took me about 40 hours of work to do my first mirror. That was a 8" F7.5
and I did a very nice job. The boring parts are getting the hole dug in the
beginning and polishing the mirror before figuring it.
There are a lot of websites that describe grinding and polishing mirors and
a quick search on Google will show a whole bunch.
The 8" size is a nice size to start with.

--
Bob May
Losing weight is easy! If you ever want to lose weight, eat and drink less.
Works evevery time it is tried!