Durante ese tiempo - the answer given is to use either tiempo or periodo. how about época?
Freeform Writing Exercise A2
Época can be used instead of período but not usually tiempo, though the teachers may know when tiempo would work. I think of tiempo as being used when thinking about time as a concept, or in general terms, like "The first time I ate callos (tripe) was unforgettable." I don't recommend it by the way.
I think of época and período as meaning a period in time or an era. For example: "The 60's was an [época / período / era] of experimentation in fashion and music." I think época is more formal than período or era, but I have used it a lot and it seems to be acceptable.
I hope that helps. Saludos. John
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