This time period is going to differ from species to species. The green cheek eggs take about 25 days to hatch. In this next picture, one egg is fertile and 2 are not. Click on it to blow it up big and see if you can tell which eggs are fertile.
Summary: Itching is found among people who take Atenolol, especially for people who are female, 60+ old, have been taking the drug for.
The blood level of a 50mg dose of atenolol will peak at after about 4 hours of administration. The effect on blood pressure is probably noticeable at about 1 hour after administration with hishges effect as the blood level peaks.