It's no secret that as Rush makes their way around the world on their Clockwork Angels tour that the clock is ticking on their days as a touring band.

Geddy Lee says, "How much longer can we go out there and play three-hour shows at that peak level... There comes a point when you just have to accept that you're approaching 60 and that maybe three hours of blistering rock is for a younger man... So maybe it's just inevitable that Rush tours down the road -- if all goes well and there are Rush tours -- aren't three hours long."

Guitarist Alex Lifeson adds, "Hopefully, we'll get through this tour with no problems -- I'd like to think that we will, and that's certainly our plan. But eventually, one day, we're not going to be able to do it anymore. That's a reality, and I don't think we should get too caught up in it. When it happens it happens, and that's it. We've had a great run, we've left a great legacy that we're proud of, and who knows what'll come after that? I mean, I think my fingers will still work for a little while longer... I don't want to be 70 years old jumping around onstage. Maybe if we're still making great music, sure. But I kind of doubt it by that point. Most 70-year-old rock musicians I see now are not really that enjoyable to watch."

Geddy and Alex, both 59, along with their 60-year old drummer Neil Peart, do the second of two nights in their native Toronto on Tuesday.