Trying to outsmart a swarm?

I am new to this and hope I am doing this right - anyway - I have a huge hive that I split 2 weeks ago. Yesterday was the first day I was able to get back in there and do a thorough check and what I found were swarm cells. They were on the bottom of 3 frames of brood. SO I took those 3 frames and put them in a nuc box along with 2 frames of plain foundation. I want to avoid this hive from swarming because my queen will lay from one end of a frame to another solid and I would like to get a queen from her (this is her 2nd year). My question is HOW long do I wait before I peek under the cover of the nuc box to see what's going on? The swarm cells were capped. I know the first one out will kill the other queens in their cells and if there are 2 then they fight it out, then the queen goes on her mating flight, and then finally she comes back to lay? How much time should I allow to see what's going on? AND when should I put these frames into a regular hive body? I have never used a nuc box before and there sure doesn't seem like there is much room in there? One frame had honey sealed so I didn't put a feeder on it - we are in the middle of a honey flow here in Arkansas - the clover if blooming like crazy. Sorry this is so long.
Thanks
arkiebee