Last Monday we all began Action Short of a Strike (ASOS), non-strike industrial action. ASOS means working-to-contract and not doing voluntary work.
This includes not covering for absent colleagues and, of course, not rescheduling classes or lectures cancelled due to the strikes. It may also include assessment boycotts.
ASOS maximises the impact of strike action, and highlights employer dependence on ‘goodwill.’
Management may direct you to prioritize tasks. For example, if marking is a priority, then you can estimate marking time.
You can then communicate the time needed to your manager, noting which other work you will not be able to do within your contracted hours.