Questions for parents with kids in daycare

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What time are they there for during the day? Also, if my son is sick at daycare, what if I cant pick him up right away? I'll be putting my son in daycare in august. He will be 3 at the time. He will be there from around 8-5:30 on the weekdays. I just feel like its so long. Do you think this is too long? Will he miss being at home? Ugh I'm so conflicted. I just hope its something he looks forward to everyday rather than dreading. Thanks everyone!