After every round of ModReg exercise, the officially released student enrolments are uploaded to EduRec. Only these officially released enrolments will be synced to Canvas during the daily sync. Please note that students cannot be added to Canvas until after the Modreg exercise is complete, and the Edurec Sync from ModReg happens.
For students enrolling to modules via the module appeals process also works in a similar manner, and student enrolment information is only synced after the appeal process is completed, and the data is available on EduRec, before Canvas can sync the data from EduRec. Although, the appeals are approved by the departments, and the ModReg system states that students have been enrolled, Edurec will still not show that the students have been enrolled (or dropped) until after the EduRec Sync period as stipulated by the Registrar's office.
You may refer to the Module Registration Schedule & Timeline as updated by the Registrar's office.
This process is similar to what it was in LumiNUS, and there are no changes to the time taken to sync to Canvas.