Final answer:
The G2 phase is the second gap phase in the cell cycle where cells grow and prepare for mitosis. It typically lasts around 5 hours. The G1 phase varies in duration and the S phase lasts around 8-10 hours.
Step-by-step explanation:
In the cell cycle, after the synthesis phase, the cell enters the G2 phase where it continues to grow and make preparations for mitosis. This phase typically lasts approximately 5 hours. The G1 phase, on the other hand, varies in duration among cells and can be as short as a couple of hours or as long as many days. The S phase, where DNA synthesis occurs, typically lasts between 8-10 hours. The Go phase is a resting phase of the cell cycle and includes cells that have temporarily stopped dividing and are resting, as well as cells that have permanently ceased dividing.