Eligibility criteria for unemployment benefits typically factor in the applicant's employment history and their reason for being unemployed. Once approved, there is sometimes a waiting period before being able to receive benefits. In the US, Germany, and Belgium, there is no waiting period, but the waiting period in Canada is seven days. Countries implement varied potential benefit durations (PBD), which is how long an individual is eligible to receive benefits. The PBD may be a sliding scale function of the applicant's past employment history and age, or it may be a set length for all applicants. In Argentina, for example, six months of work history results in a PBD of two months, while 36 months or more of work history can result in a PBD of a full year, with an extra six months of PBD to applicants over the age of 45.