Registering to the services of an online accounting company usually takes a few minutes, but what happens next depends on the situation. If you are moving from another software, just import the data therefrom in CSV format and everything will be at its place. If you are using such software for the first time, you can either manually enter data or use the auto-import feature available for your contacts, your bank feed, your chart of accounts, etc. Either way, prepare to spend up to a whole day depending on the size of your business and administration.