How long can you sleep continuously without causing pain in any part of body?

I think 3-4 hours (with painkiller and mostly it takes over 1 hour till they work).

Now I know why my back is aching! I can sleep 6-8 hours but if it is more than 9 hours the my back will ache. I think we also need an exercise to prevent our back to ache and also proper bed position.

sounds like you slept for too long. i only sleep about 7 hours or so but i have health issues that dont always allow me to sleep properly.

for me i slept at least maximum of 6-8 hours but more than that it will cause me severe headache for the rest of the day and feel weak

It depends on the day since I am a studentIf I have classes I sleep normally about 4-6 hours of sleep depending on the my schedule. I have morning classes in MWF and Saturdays so I have to wake up early making my sleep short. Every TTH my classes are still in the afternoon so I have more hours to sleep. I also suffer body aches when I wake up after a long hours of sleep. This is because maybe our body is not moving always and just stagnant especially when we are not doing the right position of sleeping.

I normally sleep 8-9 hours a day. But sometime it crosses this limit.Dont know why but I have noticed that when I sleep more than 8 hours, I feel sleepy all the day. Sometimes I suffer from severe headache after a long sleep. But usually I love to sleep as it is one of my favorite pastime.LOL.