DEVONthink To Go 3 - Updating Database

Just installed DEVONthink To Go 3 and started it.

Now I am seeing a spinner and two words underneath: “Updating Database”.

Have seen it for an hour. I have many databases in DEVONthink To Go 2, with lots of data.

Anybody knows how long this can take?

Also, do I need to keep the app open and prevent the iPad from sleeping?

I had 5 databases and approx. 10k documents, the update was finished within a small number of seconds.

I would keep it open and awake, just to be certain.

Also, how many databases and can you estimate the combined size of the databases?