My friends will reach Shimla tomorrow morning and they'll have 4 days from 28th Feb till 3rd March morning. They're new in Himachal and really want to explore Spiti circuit. Can someone pls suggest how much they can cover so that they'll return shimla 4th day, considering current weather?

My friends will reach Shimla tomorrow morning and they’ll have 4 days from 28th Feb till 3rd March morning. They’re new in Himachal and really want to explore Spiti circuit. Can someone pls suggest how much they can cover so that they’ll return shimla 4th day, considering current weather?