My United flight from Chicago reaches Brussels at 9:20 AM and my next flight to Frankfurt of Lufthansa is at 10:10 AM, I am flying to Mumbai from Frankfurt by 1:05 PM flight. I am concerned if the time between the two flights at Brussels is enough. I believe I may not have to undergo any immigration checks as I will be a transit passenger, yet I am concerned. Both flights are by business class. Any experiences you can share will be appreciated. Thanks in advance.