You might have seen a pain scale in your doctor's office before. One common type shows a series of numbered cartoon faces moving from 0 (smiling and pain-free) to 10 (weeping in agony.) A doctor would ask a person in pain which face matched up with what they were feeling. They might seem simple.
In our day this might be more than one. For Israelite King Echov, one particular foreign wife, Isabel, was one too many. King David is said to have had eighteen wives and concubines, seven mentioned by name in the OT and the others mentioned in the oral tradition.
The Prophet Muhammad is reported to have had 12 wives in total from 9 years of age up to 45 years of age at the time of marriage. He was married to only one-Khadijah-from the age of twenty-five, until his wife died when he was fifty.