I don't think there is a required time but I think less than an hour.
yes if you take a gerbil to your friends house they should be fine together as long as uyou dont leave them alone together you might just have to keep your eye on them especially if it is a boy and a girl
only about 2 hours
As long it has plenty of food and water, and clean bedding, there shouldn't be a problem.
After a fight, it would be wise to leave a man alone until he is ready to come to you.
You can leave your pet rat alone for 2 days but it is not advisable; attention is key.
you cant not for any amount of time... i believe the age at which you can leave a child home alone is 16 ...
If you're even asking this question, then never leave her alone with him.
It means as long as you don't bother her, then she won't tell everyone your secerts and short comings in bed
About 6 inches
about 10 days after hatching
To stop putting mascara on them and, leave them alone and let them grow.
About 6 inches