There are two ways to import QuickBooks company file from desktop to QuickBooks Online.
Of course, if your company file is very large, it will take longer than a very small company file, so keep that in mind.
If you chose the option in your QuickBooks desktop under the Company menu for Export Company File to QuickBooks Online, great! This is the fastest way to bring your data in to QuickBooks Online. This process generally takes about an hour, though it could be more for larger companies. They will email you once the import is done, but you can start trying to log in after about an hour or so. If they’re not ready, they won’t let you in!
If you downloaded your file to your hard drive and manually imported it to QuickBooks Online, that’s a great solution to bring in your data too. This is a longer process, and can take up to 24 hours. Again, they should email you once the import has been completed, but if it’s been more than 24 hours, try signing in again. They should have the information all ready for you!