The first task you are asked to rush is building the Kwik-E-Mart. If you are willing to wait the four hours it normally takes to complete this task you can save two donuts. You are also asked to rush the task of sending Lisa to shop at the Kwik-E-Mart. If you wait an hour for this task to complete you can save another two donuts.
During the tutorial you will however be forced to spend six donuts on a Mystery Box which will (in this instance) always contain ten donuts, giving you four more donuts than you had before.
Unfortunately you are forced to spend five donuts purchasing Homer’s Hammock.