Anwer, Jonna,
If you are starting out in SD pricing, thinking about time an activity may take, is not the correct way forward. Learn the theory, be clear in what are the configuration steps, what does each object mean, where you would need a developer's support.
When you exhibit this clear thinking to a client or in an interview, then this will lead you to success.
For now, leave the time estimates to the PM or the lead. Yes, you have to gauge roughly how complex could the business need be? and for that your standard SD pricing knowledge will be the cornerstone.
TW