Id say go for it. I was planning to do same as what u got offered now. If I just not wasted my time doing nothing with my life for years aftergraduation , I wud have chances to get sponsor by company i suppose be working. 3 yes b nothing. 34 , 31 not much diff these days. I think the timescale wud b depend on ur supervisor. I did a rubbish master research, I know because im quite perfectionist student, but i got really
ddistracted the final years. And still my supervisor let
me pass just as anyone else. If the supervisor accept u
with ur working condition like that, chances he really
don't care what ur research result will be and ur time
scale will be llike the normally other students. Sometimes, they already can handle, or like doing their research on their own, they just need student to fill the quotas for the grant money. But still u need to show some effort and mmake ur rresearch presentable