I'm a SLT although I work in adult services. The course trains you to work across the whole lifespan so it keeps your options a lot more open (I was sure when I started I wanted to work with children but then I really found an area I enjoy so much).
In terms of working hours - I generally do 8:30-4:30 just because that suits me better, other colleagues do 9-5 and because I plan my own diary there's no issue if I need to finish early one day and make up the time elsewhere as long as I make a note of it. Some of the crisis teams have weekend and evening cover rota working - but this is always made clear on job applications so wouldn't be unexpected if you took a post.
Hours are obviously more set in stone if you're working in a clinic or a hospital, but my service is pretty chilled out about it all.