How far away would you accept a preschool to be from your house?

I would love to have preschool that is within walking distance from my house. But, there is none at the moment. Thus, I have to search for one that is not too far from my house and with school bus transport service. Both of my kids taking school bus. I feel it is less tiring for them to travel with public transport too. However, one big drawback for the school bus is bad peer influence as they will mix with other students in the bus. If school bus journey is more than 30minutes I will say the school is quite far and the kid might find it tiring in the long journey. Another option is to hire a taxi driver. When my daugther was in N1, I let a trusted taxi driver to fetch her to and come back from school. He calculated the fare based on the meter and add 10% surcharge. However, compare with school bus, school bus is a better option in terms of safety as there will be an aunty in the bus to take care of the kids.