Usually, during early game I spend Chronoboost on probes, warpgate research, upgrades (attack, defence). In general, till 10th minute mark my Nexus's rarely have 100 energy.
In mid game, I don't chronoboost probes as much, and even though I still speed-up upgrades... and sometimes units - I don't use it in full.
Where should I spend chronobost in late game? I should not worry too much about it just build more guildings and keep pumping army?
Any advise is welcome!