When a Timer Boundary Event is attached to an User Task, how to take into account of non-working hours e.g. there is an User Task "EvaluateLoanRequest", with a Timer Boundary Event set to 4 hours. This task will be escalated to user Task "EvaluateRequestByManager" if the user task "EvaluateLoanRequest" if not completed within 4 Hours. If the user task "EvaluateLoanRequest" is received at 4:30 pm, the task will be escalated to user task "EvaluateRequestByManager" at 8:31 p.m. since the user working hours is from 8am to 5 pm and the task is therefore not completed. This is not correct in term of operation i.e. the user task should be escalated on the following day at 11:31 am if it is still not completed by then. In addition to working hours, how can we account for non-working days like weekend or public holidays ?