Walking time from the Zuirch airport train station to United counter

Hello experts,
I am trying to figure out how long of a walk we will have in the airport.

We are flying ZRH-SFO on United in July. My wife and I will take the train from Lucerne, each of us pulling a suitcase on wheels. We then have to go to the SBB shipped luggage service to take my bicycle (in a bag), then go to the United counter to check in. How much time should we allow for all this?

Thanks,
Reza