Dirkpitt, you may not lose your accent, but you'll probably pick up the local way of saying certain words or phrases in order to be better understood. You may do this with a local drawl or you may say it in your normal "accent." But your speech pattern shouldn't change too dramatically.
Your friends and family back home may comment on an accent, which may be so, but like I mentioned before may just be your changing to local words and phrases. I can already see that in the way you're phrasing some of your writing, but it may not be noticable in the inflection in your words.
(I'm sorry if that was a jumbled mess and only made half-sense.)

Personally, I'm originally from Ohio, and moved here in my early 20s. I speak Yankshire for lack of a better way to describe it. I can say certain words and phrases in Yorkshire, but essentially I speak American English - just a softer, less harsh-sounding version.