Our expert says:
I think you'll need to up the distance. You'll be able to see how it goes this weekend when you do 10km, but I suspect that you'll need to be doing at least one walk of 15 km by March. It doesn't mean that your 5km walks are wasted, but that one session, where you walk for between about 2 hours, is actually quite important. Otherwise, you'll hit 25km and that takes close to 3 hours, which is a huge step up from your regular walk.
So I'd say you should aim for 4 walks a week, 3 of them can between between 5 and 10km, but one should be increased progressively so that by March, you're able to walk for 2 hours. Then 25 km should be doable.
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