Sure. When you run any BOINC project on your machine, you earn credits. The rate at which your earn credits is called Recent Average Credits (RAC) by BOINC. Your magnitude on each project is a function of your RAC, relative to everyone one else on Team Gridcoin's in that project.

RAC builds up over time, and takes about 4 to 5 weeks to peak. This means your mag will also peak after 4-5 weeks.

Your magnitude is the translated to how many Gridcoin you mint per day through a number called the mag_unit. Currently this is 0.175, meaning that for every unit of magnitude, you will mint 0.175 GRC per day.