What is the most efficient technique to spread creep across a map?

Some background:
As a new zerg player, I've chosen to follow the Staircase method. Step 0 of the Staircase method is to be able to successfully complete the "Creep or Die" arcade map (in "Staircase" mode): in order to complete the map, we must spread creep to 100% of the map while putting down expansion hatcheries and managing injects on all hatcheries.

There is no opponent (either human or AI) and the point is to simply familiarize oneself with basic Zerg macro mechanics. The only way to lose is for any single Queen's energy to go above a pre-determined threshold (my threshold is 70 at the moment).

Where I am at the moment:
I've been able to finish the map (i.e., spread creep to 100% of the Daybreak map) in roughly 30-35 minutes at an energy threshold of 70 with 1 creep queen (or 25 minutes at an energy threshold of 100 with 2 creep queens) but both seem a bit slow, especially given some comments I've seen on other sites with people claiming to be able to do it in 15 minutes.

My question:
What is the most efficient technique for spreading creep (in terms of how to use creep queen and tumor placement to the fullest)? Aspects of technique include: having 1+ dedicated creep-spreading queen, spreading creep tumors in groups of 2+, patterns of creep tumor placement, etc.

There are plenty of Youtube videos and forum threads which discuss these individual aspects of creep spread technique in isolation. However, the point of this question is to understand the technique/combination of techniques which result in spreading creep across the map as quickly as possible.

To that effect, it would be great if answers could include the amount of time that their proposed method would take to complete the "Creep or Die" arcade map in Staircase mode.

A replay says a 1000 words (if not more) so that works too in case that's easier than writing out an explanation.

Edit:
In order to make this exercise more applicable to actual games, it would be equally helpful to see examples of techniques that rapidly cover 70-80%+ of the map in creep (because, in a game, it's less important to spread creep to every nook and cranny but, rather, to cover key battle-sites/expansions/etc).