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.
You are right that atenolol, like other beta-blockers, can cause hair loss. Diovan, amlodipine (Norvasc) and enalapril are somewhat less likely to trigger this reaction. Finding the best blood pressure treatment that does not do this will require some sleuthing by your doctor.