Barkinpark

Hello:

I will have a daytime layover of about 7 hours (11:00-18:00) on a weekday at YYZ from Europe back to the US. I will travel in business class. During the layover, Air Canada provides me with an airport hotel room. I am not sure how long I will stay in the room for, but I must check-in and out to avoid a charge. During this layover, I will try to see if I could get an appointment for Nexus, because I sometimes see last minute cancellations in the Nexus website. If this doesn't pan out, then I will go to downtown to have some great Chinese food, which I heard is phenomenal in this city.

My questions:

1. Is there a priority security check lane for biz passengers?

2. How much time should I budget for entering Canada after landing?
3. At immigration back to the security area, is there a Canada exit immigration check?
4. Re question 3: is there just a US entry immigration check?
5. There are Global Entry kiosks, correct? I am trying to maximize my time in downtown, because I heard that US entry immigration checks have a horrendous wait time. I hope Global Entry eliminates that.
5. Overall, when do you think I need to return to YYZ (assuming there's no Nexus open slot)?

Thanks very much. It's been more than a decade since I used YYZ, and frankly I don't recall anything.