This is the 483rd most frequent Icelandic word.
mínútum
"Minutes" (plural form).
Here, "mínútum" is the dative plural of "mínúta" (minute) and is used to express a timeframe of when an action will happen.
Hún kemur eftir fimm mínútum.
She will arrive in five minutes.
In this example, "mínútum" is again the dative plural, used to indicate the duration of the waiting period.
Þeir biðu í tuttugu mínútum.
They waited for twenty minutes.
Here "mínútum" functions similarly as dative plural but indicates a past timeframe relative to now.