hi..

Traditionally, a PhD involves three to four years of full-time study in which the student completes a substantial piece of original research presented as a thesis or dissertation . Some PhD programs accept a portfolio of published papers, while some countries require coursework to be submitted as well.

Hello,

PhD means doctor in philosophy. This is higher level of study. After completing your graduation, masters you can do PhD in any subject from any colleges or universities or any research centre where offered you for PhD. So in this degree you will get one or more than one mentor who can guide you for your project. In PhD you can research in your subject in new topic or any old research based topic. PhD duration minimum 3years to 10 years. It's total depends on your project and your work.

All the best.