calendar update

please take a look at this test site please

http://anunturiuk.com/test/masaj

i need to archive this ..

i have set sevices as 30 min. 60 min. 90 min

but the calendar still shows slots as 30 min only...

should show the slots available according to the selection ..example

if i select 90 min ... calendar should show hours 8:00 - 9:30 ... 9:30-10:00

hope you understand...