Posted: 03/11/2015 at 09:59
Hey - firstly, well done! That's massive progress in well under a year!!
I wouldn't think a sub 1:50 would be unfeasible if you keep up the good work (and I certainly wouldn't curb your ambitions at 1:50 - if you've only just started running, there could be plenty more to come off that). Sub 4 next year may be a bit more of a stretch - the step up to marathon is much, much bigger than say 10k to HM. That said, if you put in a really good marathon training campaign on the back of achieving your sub 1:50 goal, sub 4 wouldn't be unrealistic.
Something that is often said though is that on your first marathon, don't get too caught up in time goals etc. Just focus on getting round in one piece and enjoying the experience.