How does facial hair look after shaving it for the first time with electrical mashine?how fast does

It should be gone, if the electric razor is any use at all.

How fast it grows back depends on the individual. It tends to grow back faster in men than in women.

Most men will have to shave it again after 1 or 2 days. Most women will have to shave it again after 2 or 3 weeks. But many women also have to shave every day. And some men don't have to shave at all.