Both tenses are expressing an ongoing action, but we use llevar in the present for ongoing actions now and llevar in El Imperfecto for ongoing actions in the past:
1. Llevo esperando el autobús una hora.
I have been waiting for the bus for an hour.
2. Llevaba esperando el autobús una hora.
I had been waiting for the bus for an hour.
The tense used indicates if it is ongoing now or was ongoing then, but they are both ongoing actions.
I'll check the lesson to see it needs a bit more clarification.
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