I did a cake with fresh whole strawberries. I decorated one afternoon kept it in the fridge untill the next day. The strawberries wern't the freshest to begin with so the next day the looked a liitte old.But not that bad. If you sliced them I am not sure maybe someone else will know.
I would leave the cake in the fridge until about an hour before you plan to serve it. If they were nice and fresh to begin with they could probably sit out sliced most of the day and still "look" okay. The real problem I think is like you said, they'll start to leak juices on the cake.
I did a cinco de mayo cake recently that had fresh strawberries and I placed the sliced strawberried on a paper towel first to absorb any extra huice before I put them on the cake. I kept the cakes in the fridge and they were sitting out about 4 hours when we left they still looked okay.
Thanks koolaidstains. I just put the whole cake in the fridge here at the office and the boss loves it! I told him to be sure that when he got it home to the Missus that they put it back in the fridge and take it out right before their ready to serve it. So hopefully, that will take care of itself. As much as I think I know about cake decorating and I learn everyday there's something else I don't know 
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