This is a regular verb. It follows the conjugation pattern of the verb falar.
Present:
Essa tarefa ocupa muito tempo.
This task takes up a lot of time.
Imperfect:
Essa atividade ocupava as tardes dele.
Essa atividade ocupava as tardes.
That activity used to take up his afternoons.
Conditional:
Isso ocuparia mais espaço.
This would take up more space.