Here's the breakdown if you look at the quest in parts like the seasonal quests.
Part 1
"Talk to Summer Feels" - "Call Summer Feels"
- 14 hours 5 minutes 48 seconds
Wait time of at least 23 hours 59 minutes. If you are on top of the quest and start the tasks immediately right after each other the wait time is only 9 hours 55 minutes 12 seconds. If you take longer than 24 hours to do part 1 there will be no wait time.
Part 2
"Ask for advice from Summer" - "Phone Bree"
Wait time of at least 1 day 23 hours 59 minutes. If you are on top of the quest and start the tasks immediately right after each other the wait time is only 7 hours 55 minutes. If you take longer than 24 hours to do part 2 there will be no wait time.
Part 3
"Watch DIY Homes" - Email Bree the Photo"
Wait time of at least 2 days 23 hours 59 minutes. If you are on top of the quest and start the tasks immediately right after each other the wait time is only 6 hours 20 minutes. If you take longer than 24 hours to do part 3 there will be no wait time.
Part 4
"Check mail for Bree's letter" - "Mark letter K on Chessboard"
Wait time of at least 3 days 23 hours 59 minutes. If you are on top of the quest and start the tasks immediately right after each other the wait time is only 5 hours 55 minutes. If you take longer than 24 hours to do part 4 there will be no wait time.
Part 5
"Talk to Kewl Tones" - "Try to wake Kewl Tones"
Wait time of at least 4 days 23 hours 59 minutes. If you are on top of the quest and start the tasks immediately right after each other the wait time is only 4 hours 15 minutes. If you take longer than 24 hours to do part 5 there will be no wait time.
Part 6
"Talk to Kewl Tones" - "Create a feature wall"
Wait time of at least 5 days 23 hours 59 minutes. If you are on top of the quest and start the tasks immediately right after each other the wait time is only 7 minutes. If you take longer than 24 hours to do part 6 there will be no wait time.
Part 7
"Photograph the house" - "Say Goodbye to Kewl Tones"
No wait time. Time remaining for limited time prize at the start of part 7 is 23 hours 59 minutes. If you are on top of the quest and start the tasks immediately right after each other the time you have left before the limited time prize is gone is 26 minutes. If you take longer than 24 hours to do part 7 you lose the limited time prize.
Total time without wait times = 129 hours 47 minutes
Total time with wait times = 167 hours 34 minutes
It gets hairy in Part 6 and 7. For parts 1-5 as long as you hit the wait times (even if it's only "wait 10 minutes for...") you are right on track and there's no need to use LP. Parts 6 and 7 cut it real close to 24 hours per part. If you manage to get to the wait time before part 7 starts that's great. No need to use LP to start on the next day. It would only get you 7 more minutes. If you wanted to use minimal LP on part 7 I would only use it on the "Debrief Kewl about interior design" task and the "Take selfie with Kewl". 2 LP to get 3 hours of buffer time.
If you wanted to use more LP to have less stress then you can use 10LP to skip the wait time for part 6 and then the 10LP to skip the wait time for part 7 if you need to.