This is what we did at 6:

Science/reading (as in I read to him) - over breakfast.
Science experiments - always some ongoing theme over here.
Math - he gets to choose from a total of 2 or 3 workbooks. I try to keep it balanced among them. We've abandoned some if they're unpopular. Revisiting them months later sometimes helps.
Writing/Language - he flat out refused, so I left it at that. Plenty of catchup this year, but I had to choose my battles.

All this is done between 9am-12pm. Rest of the time - he's reading, asking questions, looking up Brainpop, Lego (a lot). The afternoon is for me to chill, plan, do my own thing. He goes to the park at around 4-6pm. Sometimes preferred to stay in. Had regularly scheduled playdates which, when I look back, were a complete disaster. crazy