It all depends how full the brooders are. Right now I'm taking a break from hatching till I have more space in the brooder. (of course when the weather breaks that won't be an issue) I am getting some test eggs in a few weeks and plan on ordering some leghorns and pied guineas for right after. By then my Pearl Guineas should be laying so I will test their eggs next. LOL...oh wait, I'm not done! By then end of summer my BCM's and Silkies should start laying so I'll have to test all those. I have two LG's. 1 is the incubator with turner the other is for hatching only. So I often do staggered hatches.
Now...the big BUT: if someone said tomorrow 'will you test these?' or I found a really great deal on some show quality BCM's....I'd have the 'bator fired up in 2 minutes flat! So that is all subject to change.