How much off time is devoted to your Guard/Reserve service while not in uniform as a TPU?

If you are planning on making it a career, I would plan on a minimum of 7-10 hours a week.
If you are in a key leadership position, or hope to be a high performer, I would use a minimum of 15 hours as a planning factor.

I'm making no judgements about how it "should" be. Just how it is.

Seems like most of my off time is dedicated to my Reserves. Conference calls. NCOERs. Counsellings. eLAS taskers. SSD and other DL. Training Schedules........and the list goes on and on and on.......

But there are days where I have to say "I'm not touching my email or anything else for the Army" so I can spend time with the family.

LTC Stoneking nailed it on experience and expectations, when in Command expect more time and every weekend.
It is the price of being in the leadership of the Reserve.

Love being a grunt. Passion for the job makes it easier to work after work. Also medication.

I recently left Company Command as a TPU and I can say it is the most frustrating, challenging, but also worthwhile position. After all, we became commissioned officers because we want to lead Soldiers. Leadership takes sacrifice. I served as a commander while also being a full time police officer in a major city. Many times I would be on the monthly huddle call or training meeting call and have to jump off because of an emergency call....

A couple hints: 1. Empower your subordinate leaders. Mentor them so they become able to handle the issue at their level (always keeping you apprised for your SA). 2. Work with your AGR/ MILTECH staff to get into a schedule that works for you (I worked nights so my staff new not to contact me before 1300 unless it was urgent and demanded my immediate attention). 3. Don't be afraid to work with your commander if there comes a time where you need to take a knee and not be in a critical position. I was fortunate to have commanders who understood that TPU pay does not pay my bills and that our civilian career has to come first sometimes.

The higher up you go, the more of a time commitment it is. One tip for all of you out there who spend considerable unpaid time is to document your time as "Points Only" on a DA1380. You might not get paid for that time now, but documenting those soft points can get you a larger retirement check later!

It depends on your job and boss. I was on primary staff and command it was about 1-2 hours a night. It was much less for other jobs to a couple of hours a week. This isn't including PT which is about 30 - 60 minutes 5 days a week.
I've had AGR and MIL Tech bosses who expect daily contact Monday to Friday plus time at drill. It did help me with time management. It also made me understand what they do during the week and non-drill weekends.
I was a Brigade S-1 and understand your situation. I relied on my AGR NCO and other full timers for help. I got access to MEDPROS and other systems to help get information. You should keep in mind being picked as the S-1 is usually for the more sharper officers who can get things done. It's one of those jobs a lot of people don't like but, really helps their Army career.

As LTC Stoneking said, 7-10 hours a week and sometimes much more. I have spent several early mornings and late evenings working out CONOPs, etc in order to effect good training for my guys for the next drill and beyond. It's a balancing act involving life honestly. You just do it. While you don't like the position that you're in, it will change. How you handle it is what matters.

I'll add that it helps to have a day job that allows you to pick up the phone on MIL business. You make up for it by extending your work day. Being "available" gets noticed and breaking up the time during the week into bite size chunks helps. Generally the extra time starts out lower and increases with rank, responsibility, number of people you're responsible for, etc. So you don't get stuck doing it all, it's imperative that you appropriately delegate. That said, know clearly what it is you're delegating and the level of effort to do it. So how much is enough? If you show up for drill and you don't have a discreet and small fix-it list that you'll hit the S-1 up with, you didn't do your job. Weekends are for execution, not trying to figure things out while people mill around.

Actual time in the week. COL Vincent Stoneking is in the correct ballpark. I don't know about O-1/3 level of effort because I was AD. O-4 was 10-12, O-5 was 15-17, and O-6 was 20-24. Since I was CS with the Navy, I came into work early to deal with the 3000 mile screwdriver, and then could do more localized stuff as the day wore on. I generally left after most did to ensure I gave a full measure to the day job. When you are O-5/6, some of your time is "give back" in that you're spending more time bringing good people along because you're nearing the end of your career. My normal workday wound up being from 0600-1900 frequently. That allowed for short days to referee soccer, do something with the kids, etc.

I can tell you that I averaged almost 75 days a year between drill, schools, additional duties and AT. Guard units generally have additional unit training assemblies available to compensate the leadership for some of the additional duties, but if you are in a command position, I'm like LTC Stoneking, I ended up spending at least 6-8 hours a week on paperwork, schedules and planning.