Design work comes in ebbs and flows, generally regardless of the company.
If the consultancy has an active business you can expect that 45-60 hours is probably a normal level for a busy week. If a client has you in a crunch, be prepared to work weekends to make that big deliverable. Again, this will depend on the consultancy and their client load.
For a truly entry level position, be prepared to work more than that in order to improve your skillsets (you do not come out of school equipped to be a professional designer, and the time it takes to learn new software and skills will increase the amount you have to work). A mid level or more Sr designer will have a more predictable workload along with better time management skills.
In terms of travel - it will depend heavily on the company, your role, the location of your clients and your involvement in manufacturing. As an entry level employee you would likely travel overnight much less, there are more senior employees who will be the primary ones engaging with clients on long business trips. But if your clients are local you would most likely be going and accompanying the lead designers on trips so you can better understand the work you’ll be doing.
If your role has a larger research or manufacturing component to it, then you would travel more. I know people who have spent months abroad in Asia for projects where they need to be directly tied into manufacturing.