Drivers could be expected to spend up to 11 hours behind the wheel
Unite the Union says current rotas for bus drivers are underlining a lack of work-life balance.
Services were stretched over Easter, and some cancelled - with casual drivers being used to supplement the schedule.
But Debbie Halsall, of Unite, says the hours being demanded of her members are not fair:
Vote on Castle Rushen High School funding 'very unlikely' before election
It had previously been hoped Tynwald would consider the plans in June
Ramsey Commissioners to host public meeting about cottage hospital
Commissioner Juan McGuinness says residents deserve 'clarity' about ongoing situation
WCAS reuse garages to reopen on trial basis
Residents will be able to bring items for reuse from Wednesday
Manannan's morning sailings cancelled due to weather conditions
Later fastcraft services currently unaffected