A healthy cell spends most of its lifetime in

The cell cycle consists of three stages: Interphase, Mitosis (division of the nucleus) and cytokinesis (division of the cytoplasm. During Interphase, the cell works and perform its daily normjal activity. So, a cell in a salivary galnd makes saliva in interphase and so on. Most of the time, the cell is working and doing its things, contributing to the normal functioning of the organism. Mitosis is a quick process (we don't want the cell to spend ages dividing ... we want it working for our welfare) and cytokinesis is shorter than mitosis, is only the division the cytoplams. So, YES. The answer is Interphase, fortunately for us.