What are the requirements for bees to move into a skep and what's required to get the swarm in x amount of time?

[Sukotto82]

I'm sitting at a Medium wild bee hive with 26 flowers nearby and an empty skep placed a couple blocks below it but I don't see the "swarm in x time" tip that shows up in some videos I've watched. 

Do I need more flowers around?

[redram]

It can take awhile to show up.  Maybe several minutes, from what I've seen.  26 should definitely be enough to get you a readout, at least.