During game play one of the most important questions is: how many harvesters do you have right now. Will it be effective to build 3 more harvesters or it is better to build additional production building (for example)?
AFAIK optimal number of harvesters per base is 30: 8 minerals + 2 gas multiply by 3.
But often is hard to detect how many do you have right now. From what I see you could go to your minerals line, select all harvesters and see how much do you have. But sometime it is hard to do that (other units, non-harvesting SCV/probes). Time - is also factor. I would like to look into my supply numbers and know something like this: currently I have 50/64 supply.... how much harvesters do I have 20? 30?
Usually in replays that I lost my opponents have around 27-35 harvesters on 1 base and 43-48 with expand... Usually I have less...
Probably I just need to build those harvesters CONSTANTLY till supply id less then 60/80? (don't forget to build army too)? Probably I don't need to worry that I have too many harvesters?
Any thoughts are welcome!