Posted: 14/08/2016 at 16:57
TR. I wouldn't get worked up re the hills. The Llanberis Pass climb is pretty steady & isn't really steep - there is then quite a long descent which gives your legs the chance to recover. The Beddgelert climb just after 1/2 way catches quite a few people out - I'd say it's more of a drag than a climb - more often there's a slight tail wind to assist. The final climb is pretty much a struggle which many runners (including those near the front) walk parts of!
Speaking to people over the years, the general consensus is that runners should add about 15 minutes to their flat marathon time to estimate their Snowdonia time. I'd say for quicker runners it's nearer 10 minutes. Sub 3h30m should be well within your capabilities if you ran 3h4m on your 1st marathon