I suppose it would depend on the city, but surely many cities do not have any term limits and mayors have been known to serve for many terms.
A mayor is allowed to serve up to 2 terms. That's 4 years.
There are no term limits for mayor in Chicago, IL.
3 Consecutive Terms
Two
two-four year terms
As many as he or she wants.
2 4-year terms
Two terms
The mayor of Philadelphia, Pennsylvania, can serve a maximum of two consecutive terms. Each term lasts four years, and after completing two terms, a mayor must take a break before running again. There is no lifetime limit on the number of terms a person can serve, as long as they are not consecutive.
In the Philippines, a mayor can serve a maximum of three consecutive terms, with each term lasting three years. After serving three consecutive terms, a mayor must vacate the position for at least one term before being eligible to run again. However, there is no limit on the total number of non-consecutive terms a mayor can serve throughout their lifetime.
A mayor's term for Alaska is three years. But I don't know how many terms they may serve.
In Winnipeg, a mayor can serve a maximum of four consecutive terms. Each term lasts four years, so this allows a mayor to serve for a total of 16 years if re-elected. After serving four consecutive terms, a mayor is ineligible to run for re-election until they have been out of office for at least one term.