I will allow two hours. I hope to do the work in under one hour.
I will video it, so editing will take the most time.

I hope to clear time for Inktober by getting ahead with my regular fine artwork and art tutorial videos during September. 
I am also a professional artist and Inktober will be a side project. 
I also spent last night selecting the subjects I will sketch in ink for Inktober. That way I can get straight into the work, form the first of October, without doing any research time. I'm planning the body of work to be a Christmas gift for a special person, and that too will make it worthwhile (given this isn't going to b a commercial project) to allocate a couple of hours if needed, daily, to create this thirty-day project. 
I am not planning to do detailed work for Inktober, I hope the work will be fun. 

Rules and guidelines are different things. Artists are free to interpret both as they wish. 
When it comes to posting contents though, we need to respect the rules of group organisers. 

I'm in a facebook group (at the moment at least) an I'll be following Inktober on Twitter and may add nome of my Inktober sketchers to Pinterest. I will be abiding y the rules for all those places, which can't be hard because my work is al for general exhibition. 

As for the rules of what medium you use for Inktober, I do think that inktober should be ink.
Why ever would your submit anything else? I have no problem with a pencil under the ink sketch. 
Well, I didn't see any rules to be a problem. 
I will expert facebook's rule of no adult only material being posted here to be upheld. There are places for x rated material, and Facebook isn't one of those places. So, I trust the group I joined on Facebook stays clean.  There are some fabulous artist's there who produce quality and wholesome art.  I love encouraging them. 

I just ordered these items for my Inktober project. Prices are inAustralian Dollars. 
I'm not selling them. 

Copic Multiliner Sp Set A  
A great pen to learn inking on. I have the 0.1, 0.3, and 0.5. 

Pentel Pocket Brush Pen With 2 Refills - Black  
8 Refills  for Pentel Pocket Brush Pen - Black  
~A work horse. It has a nylon brush tip, and offers a smooth and powerful line but can also give you fun expressive lines too.  It lasts well and give a fine delicate line if you need it.

ZIG - Kuretake - Brush Pen - No. 60 Gold   $16.99
Copic Gasenfude Brush Pen Black  $11.99
Gelly Roll Classic Fine Point Pen 3 pack - White  $8.99
Sakura - Gelly Rolls - Souffle Opaque Ink Pens 2 Pack - White  $8.99
Zig Sumi Pen Ink 60ml Black   $15.99