Time is a primary project constraint, but as this post from Way2PM points out, it can either be a more controlled constraint or one that brings havoc and panic to your project in later stages. By making sure to fall into the first group, you're more able to control every other dependency in the project. The article tries to concisely present 5 “winning steps” when it comes to managing time in projects. One of these steps is to find your SME and involve them early:
Interact closely and involve the business experts or the SME's from the very beginning. This is even truer in the case of project reviews. If the project involves any major complexity such as a new client or working on new technologies, then the activity dependency is even higher. Once again PMBOK guide has a proven process for activity sequencing which can be used for better time management.
Alongside involvement of the SME, a project manager needs to get the project team involved from day one as well. This seems like a no-brainer (of course the project team will be involved in the project they are working on, right?), but the truth is the team is often left out of estimating, planning, and scheduling. After all, if they are the ones who will be doing the majority of the work, they probably have a good idea of how long it will take them to complete it.