I never understand why we have these asks, it’s not like a 5km is long or takes a lot of out of you. Just spend 14 -18 minutes running a 5km in road shoes and reduce your time by ~3% if you will race in spikes
otherwise no one knows
You must be so fun at parties with that type of response....good lord
As you can image when you get asked stupid questions, mate its less time then a normal training session, just go for a run an find out