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Maziyar from Sir Roger Manwoods School and Rachel from Histon and Impington Infant School both sent completely correct solutions to Planet Plex Time. Maziyar says:

School starts at one 'o' clock.

He'll be about two get up two hours later.
He was about to go to sleep 5 hours earlier.
It is 9 hours before school finishes on Friday.

Rachel explains how she worked out the final part:

I worked this out by saying that 1 hour later he gets up on Thursday; 2 hours later he goes to school on Thursday; 3 hours later he has lunch on Thursday; 4 hours later, he plays on Thursday; 5 hours later he has dinner on Thursday; 6 hours later he goes to sleep on Thursday; 7 hours later he gets up on Friday; 8 hours later he goes to school on Friday and 9 hours later he finishes school, and is about to have lunch.

Well done both of you.