Cleaning Time

I just finished cleaning the kitchen and dining room. They had gotten pretty messy and I was putting it off. I don't know why I always put cleaning off like that. For some reason it feels like it will be so hard and take forever to get it clean. It took 1/3 hr. Only 30mins and the only thing left is to wash the dirty dishes. Why is time so hard to judge? I know it doesn't take hours to clean two rooms, but I feel like it will take hours until I actually get started.