If your puppy is less than 5 months old it is unlikely they can hold their little bladder for the 8 hours you are at work, maybe 4-5 at most.

[...] A good rule of thumb is take the puppies age in months change it to hours and add one hour for the length of time it can spend in a crate. ie a three month old puppy can hold its bladder for 4 hours tops.

Mark Mitchell
Vlaamse Bouviers