Dwell time

Hello Guys, I need your advice in regards to the following issue. In our manufacturing site when the first operation finish the product needs to rest for 4 days before goes to the paint. In between these 2 opearations we can nevertheless do another operation. we are able to manage another operation. The operations are 1. Mould 2. (Not always) trim 3. Paint. Time between 1 & 3 is called dwell time. Does anybody know how can we handle this in SAP? Consultants suggested wait and queue time but this did not seem to work. Any suggestions? Thanks