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@PhilPub
I'd add that a useful way of progressing mileage is to gradually build one "long run" per week, as opposed to just making each run a bit longer. Runs of different length will train different energy systems, and therefore different elements of fitness. So, running over an hour will help to develop increased number and size of mitochondria in the muscles, essentially the building blocks of improved endurance. You'll most likely benefit from slowing the pace down of these runs - incorporate run/walk if you need to initially - and just let the pace improve as you get fitter.
So add a km to one of your 10k runs, make sure you give yourself a rest day (/active recovery/cross-train, etc.) the next day, and maybe build this up to 15k over a few weeks. How far you take it obviously depends on your goals but runs of well over an hour if you can manage them regularly are great for building an endurance base.