There are ways to estimate HR zones including the formula 220-age to find out maximum heart rate. Zone 2 is approximately 60-70% of maximum heart rate. For me, HRmax would be 220-30= 190.
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While training in zone 2, you should easily be able to hold a conversation without feeling out of breath. For example, if you were speaking on the phone during the workout, the person on the other line could tell that you're exercising but not breathless.
Zone 2 running is “hard” because most people find it very challenging to stay at a slow pace for a long time. 45 minutes should be the minimum time that you should aim for. Until your aerobic base (and mitochondria) are better trained you will find that you have to run at a painfully slow pace and walk many hills.