I was never good at doing both sides the same with a hand file. Saws always cut crooked as a result. I used to take several at a time to get sharpened after a few of my filings.
Many years ago I would guess 20, I bought a Harbor Freight sharpener for about $25 on sale and it has worked well for me. I cut about 4-5 cord a year for my own heat. Sharpen chains as a bunch about once a year.
I'm a youngster at 72 but love to cut my firewood and feed my Lopi Liberty!
I have an old Stihl 034 super with 16 & 20 bars. That I have had about 30 years. I think my smaller one, the model is a Stihl MS170 and a MS180 that was given to me. Last year I bought a Battery Stihl I really like that.
With 4 batteries I can use a break by the time I am out of batteries cutting the limbs and smaller stuff.
Bill