Hi Adikumar,
I'm doing my PhD part time over 5 years, I'm doing it in Bristol but I live and work full time in Ireland. I am able to carry out some reseach in Ireland but the lab work has to be done at the Uni, We use email, phone and sometimes Skype to keep in touch but I also travel over about 4-5 times a year for meetings, short courses ect. My supervisory team came over to me and stayed for a couple of days while I showed them various trial plots, plant samples etc.
I suppose it depends on how far away from the Uni you live, even though I,m in a different country I can either fly over -it takes 45 mins and flights can be as low as £10, or I can drive over using the ferry.
Obviously working full time and then working on a PhD doesn't leave you much spare time so you need to be fully committed to it, I love doing it so that makes it easier.