7:10 is usually when mid hasnt gone back yet and they just dinged 6 so their blue isnt warded(Dragon might be). If there jungler isnt there within 10 seconds of their buff spawning you usually get a free blue(Worst case scenario they steal yours); if he is make sure your mid and side lane know you will need help.
Do the same with their red(assuming they do the regular route). If you can control their 1st few buffs you will snowball over their jungle and their mid if you donate your buffs to him.
Also know the respawn timers on small camps and general clear time/route for most junglers.