Be honest with yourself regarding what level of comfort you need and how long you can be away from home while being comfortable. If you have never travelled before you might be surprised that home sickness can kick in after two months on the road. Will you truly be enjoying your travels if you would rather be home surrounded by familiar food, water, friends and family?
I suggest that you schedule a trip length that allows you to break the trip before you want to go home. If this will be your first trip, you will almost certainly return with the travel bug and be inspired to continue your travels throughout your life – there is no need to see the whole world in one hit.