Why doe sit take me so long to have a bowel movement. somtimes on toilet for almost an hour?

Constipation: Answering Your question is hard, because many things affect a person's bowel habits. Sounds like you have some constipation, that may be chronic. This is not uncommon, particularly if taking certain medications (most notoriously, narcotics). You need a colonoscopy, to make sure there is no serious GI problem. If that is OK , I would recommend a laxative like MiraLax, (polyethylene glycol) that can be taken Daily