Is it better to wait til you can make multiple attempts per session or does it matter. I usually make an attempt every time I have the required amount for an attempt. Gone through ~200k so far and still searching. The lab only has 2 discoveries.

doesnt affect your chances of finding anything,
it is a good indicator you have more actual research you need to do, and may suffer by pouring too much into the lab too early.

wait till it gets higher, I personally poured 20 million into the lab - i dont know how much combined it was from everyone - before we made another discovery, its just luck of the draw.

unfortunatly we've still got a number of discoveries to go as well oh well got both velox and aegis now so thats good

I had to spend/vaporize 1.5M research on CTlab with 3 discoveries to achieve another discovery... not and easy medal, if you are not a lucky one.

I spent only 100k on a 24k a try lab and got the medal.

I've spent over 100M trying to unlock the final discovery.

The last one is always harder than the ones from the start.