That depends on the condition you were in during pregnancy. The more athletic, more exercise, and nearer your ideal weight you were, the easier it will be to get back. Beyond that, it mostly depends on how hard you are willing to work.
9 months
Men usually don't get pregnancy symptoms.
A pregnancy takes about 9 months.
One month
It can take 8 to 12 days following sex for a pregnancy to begin.
a title takes how long to come back
Just as long as it takes for the pregnancy test to work, normally 5 minutes.
a year
Sorry to say but the nipples will never go back to look like they did before pregnancy and breastfeeding. Every woman's body is different when it come to pre-pregnancy and post pregnancy, however, my sisters went back to "normal" about 4 months after. Mine still hasn't yet, but i'm barely 2 months post. I'll update in 2 more months.
As long as it takes to get it back.
There is a possibility of pregnancy anytime intercourse takes place.
The blood travels from the heart, all through the body and then back to the heart again. This whole process only takes a matter of minutes.