Total time consumption means total time that is count for particular endpoint during selected timeframe. So you can have there few really slow requests, or massive amount of fast ones. In your case, I suppose that home page was executed the most often 🙂
@Wai Keat C. Without the ability to contextualize this in a specific scenario here's my best explanation for that 'Total time consumption' in top web requests.
This is a visualization of the total time spent processing that request within the timeframe of the chart. These bars are a indication of the consumption of individual requests relative to the other top consuming requests in consideration.