It doesn't take too long, but depending on your device and its speed it can be frustrating to wait a bit or perform extra steps for syncing to happen. This allows Google Drive to catch up with itself and sync the changes properly so you can access them. Often it required closing down the app and reopening it to see the changes. For example, if changes were made from your desktop, opening the file from your cell phone may not show the changes right away. Sometimes you will see a delay when accessing a document from a device different than the one the changes were made from. Google Drive downloads and uploads the entire document to sync it. The files and documents are then synced within the program so they can be accessed from any device or browser. When you open and work on a file, those changes are saved automatically. This is one area where Google Drive and Dropbox really differ. You can use the referral program with a Dropbox Plus account, too, but referrals are still capped at 32 and you earn 1GB of space per accepted referral invitation. Referrals are capped at 32 for a total of 16GB with a free account. For every person that signs up from your referral, Dropbox gives both you and the new signee 500MB of free storage space. From the referral page, send email invites to friends and coworkers. Dropbox does have a referral program to earn additional storage space.

How much is dropbox storage