Can you give an example of breaks in a long fast run? Will 30 seconds do it? How many breaks? Is the goal to make it like 400s at 10k pace on the road or like 3 x 5k?
This is something that you might discover for yourself.
The workout design/format is what´s part of the training indiidualisation.
The only norm for one FT is that you don´t stop and walk during the interval recovery, or just stop and walk for a very brief/short lenght periodof time.
However i want give some examples that might fit on you just that you might understand.
fast run done with 4min to 10min to 15min to 20 min/fast with 1 to 4min/easy jog.