DD is 8. DS has been offered a time slot for a therapy which is in a different town. It counts as a school lesson so would be compulsory for a year if I agree to it.
The therapy ends at half past and if he is out exactly on time we would just (barring any unforeseen problems like train barriers being down, DS being late out or needing the loo) be able to get the :46 bus, arriving at :50 in our town. Then a 5 minute walk home.
DD finishes school at quarter to, has a two minute walk home.
If we miss the bus, next would be at :20 and I would not be able to contact DD.