It is not possible to choose the hours
it is possible to choose the hours too it's just a couple more clicks to do it
lets say it's 12 noon now,
so you click & add the 12noon & the 1pm
then delete the 12 noon tab
now select the village that is 3 hours away & when you press the + it will autofill the 3 hour slots from 1pm (rather than 12noon)
and save
Then repeat the above adding in the 12 noon & 1pm + 2pm (and delete the 12noon & 1pm tabs)
add in the village & autofill from 2pm
and again save
(hope this makes sense)