Ideally as per given scenario 3 jobs makes sense as one for 10 minutes check with new items present and other for 10 items as total items exceeded 10. but 6 looks little different.and also as far as the pattern is concerned I see two robots start at same time…which is little different as at any given point of time two would not start at once
let me try some testing from my end too and if you could try any other possible combination by changing unprocessed time check to 30 …that might help in understanding better
cheers