Hello- I'm interested in the DOT Hazmat Transportation-Virtual Instructor Led Training (VILT). Two employees require the class certification.  Will these employees be able to choose the date of training that works best for their schedule, or will they be required to complete the course on the same day in the same online class? 
Must the class be completed in 1 day, or can it be completed as time permits for their schedule (pre-recorded training)? Please let me know, thank you.