Choosing MySQL or NoSQL Database For My Scenario

I have a scenario where i have to store timesheets of different projects. The object graph is like this: Timesheet->Project->User

A user can create multiple projects. And a project can have multiple timesheets. So in my scenario it is expected that timesheet data will grow continuously. So if I create a table for timesheet in MySQL the data in it will start growing continuously which can become a bottleneck. I have to read timesheets also i have to edit them and create new ones quite often.