Yes, I understand in the Key Concepts manual you mention to keep it around 4 weeks tops. Correct me if I am wrong but I think intensive could be useful for the following reasons:
1: Intensive tempo is a great technique tool.
2: Allows the athlete to get some upright running early in gpp.
3: Athletes who will be indoors from Nov-April it allows them to get some longer work done before being shut indoors for many months.
If I was to use intensive tempo late GPP would you recommend to drop a speed day or could the setup below fit the bill?
M-W-F: SPEED
TUE-THUR: EXT TEMPO
SAT: INTENSIVE TEMPO