An important responsibility of a project manager is to manage time as a constraint which involves keeping an eye on the project schedule, ensuring team members are delivering on milestones, while having to keep track of your own time spent as well.
While your role is varied since you need to cater for every aspect of the project from cost management to human resource management, you are accountable for the overall delivery including all tasks tied to the project. This does not mean that the project manager must micro-manage everyone on the team as individuals are primarily responsible for various aspects of the project.
However, we find that a number of project managers spend time doing too much management and fire-fighting and then they are left with little or no time to work on strategy, leading the team and focusing on tasks that only they can perform. An efficient project manager, therefore, should be able to effectively develop strategies for his/her team and perform oversight functions effectively all while being on schedule.
To support you to be more professional as a project manager, here is an infographic with very helpful time management tips with complements from Nutcache.