i want to sell a service at home. This service has two

Hi

i want to sell a service at home.

This service has two diferent durations one of 30 min an another of 60 min.

What i really want is when somebody chose one of them the plugin generates an extra time of 30 min in order to cover the didplacement between fiferent locations.

I mean if somebady wants to get an appointmen at 10:00 of 30 min, in the schedule appear busy from 10:00 to 10:30 choose by the client and an extra 10:30 to 11:00 ( also busy) automaticly by the plu in. And of couse the costumer only pay for 30 min.

Is posible to do that.

I was trying to do with some of the parameters but i couldnt.

Thanks