Predicting light/dark team cash bonus

[Jayzer]

Hey I just had a quick question and I think this is the right place... every few minutes your team AI buys a weapon and armour upgrade and then splits the rest among players. Is there any pattern to this? ie so many normal spawns then a spawn with cash? is it done every x minutes?

this could help me predict my purchases and save time and money... I hate to tp back into my lane only to see that I just got the amount I need for my next shop purchase as I land in my lane >.<

thanks
j