How do you speed up the time the sims are at work?

You dont. The game is played in real time and so if they are at work for 8 hours it takes 8 hours till they come home again. Its they way the game is.

Well,, you can't speed, but you can cheat!
All you have to do is, go to your time thing on your phone and change the time. Furtherrrr... There might be a few steps I missed out soz.

Make your Sims plant anything.Plant beans for more money.Go out of the app double tap the home button and press the sims icon long and press the red minus.Then go to settings to general and press set date and time.Change the year to 2011 since this year is 2012.Go back to your sims game until it loads.Go out of the app again and double tap the home button and press the red minus to turn it off.Go to settings again and change the year back to 2012.Go to your sims and collect your beans and XP.Your sims will still be planting but it shows 100% so,double tap the home button and hold long on the icon and press the red minus.Your sims will be normal.

You don't have to spend money to be able to speed up time. All you have to do is go to the settings. Once you do change the time to a day later then turn your device off. Turn it back on and click the Sims don't wait for it to load. Once you see the EA symbol click the home button. Keep doing that until you start to hear the music. When you hear the music let it load until the box where it gives you Tips about the game. Then click the home button until the game is fully loaded. You should be able to have your daily gift and your Party Boat gift(updated version for The Party Boat)