Responsible for overall client planning and interaction. Managers are required to identify opportunities for partners to sell new work as well as to oversee engagements at a macro level, while leaving the details to the senior. Tenure at the manager level is entirely dependent on the firm and the individual's position within a firm. The first partnership-level opportunity arises, at the earliest, after about five years. The main role of the partner is that of a rainmaker, maintaining relationships with clients.
Younger partners tend to be more sales-oriented.
However, I found this to be similar to many of the large corporate clients which I worked with during my tenure.