Roof rats are the worst rodent pest in the state of Florida and most abundant. The Norway rat (Rattus norvegicus) that is familiar to most people is rare in Florida. Roof rats consume and destroy stored animal and human food, attack fruit crops, and take up residence in attics, soffits, hollow walls, and out-buildings.
1 The sperm brings in another 23 chromosomes to complement the 23 held in the egg to get to a total of 46 chromosomes - what all of us normal people have.  We know from in vitro fertilization studies that the egg is only capable of being fertilized for about 24 hours after ovulation.
Now for your question.... fertilization takes place in a matter of minutes, once the sperm reaches the egg. For sperm to get to its destination, it can take anywhere from 15 mins to a few hours.t does not take 3 days for the sperm to get to the fallopian tubes to ovulation. It can take minutes for at least some of the sperm to reach the fallopian tubes where they are stored waiting for the egg to pop out if it hasn't already popped out.