This is the 5743rd most frequent Russian word.
продлили
"Продлили" means "extended."
In this sentence, 'продлили' indicates the extension of a duration, generally performed administratively.
Срок действия визы продлили на три месяца.
The visa validity period was extended by three months.
Here, 'продлили' conveys the extension of a period or schedule due to necessity.
Продлили рабочий день из-за срочного проекта.
The workday was extended due to an urgent project.
In this context, 'продлили' refers to the elongation of a held state or condition.