It depends on how you're applying. If you're a referral through someone already at the firm, expect 2 interviews. If you're applying through the website/resume, then add on at least 1 more interview.
If you're going for a technical position, you will be quizzed on basic building science theory and real-life practical situations, so you should know your stuff (I would imagine this would be the case for other non-technical positions too).
It depends on what one wants - if they want to be promoted and shoot up the company ladder or rewarded, I would suggest 45 - 55 hours a week for sure. If one wants to be an "OK" or "average" achiever, then 40-45 hours a week, but expect promotions/rewards to go to those who put in more hours.
I was hired after direct contact with a manager at RDH through my post-secondary school work. Met directly with him and completed a practicum before being hired after graduation. Hiring new graduates, who've completed co-ops, directly out of schools like BCIT, U of T, Ryerson, and Waterloo is common.
The work at RDH is leading-edge and provides a great opportunity to learn. Work is difficult but rewarding. Company culture is excellent and the atmosphere is great.