More Prominent Duration UX

I'm noticing that the Duration selection option is not prominent enough for users to actually select their booking duration. I typically have 3 lengths of time available, and almost always people select the first/shortest (typically 15 minutes) then don't realize they've scheduled such a short meeting. I think duration is just too subtle and needs to be more prominent. I'd prefer to not have to code around this but I'm open to a quick fix while a long-term solution is added. Thanks for your consideration!