I recently became a leader of a Daisy troop for my daughter, and while I enjoy it very much, it has been a huge time commitment.
Before we held our first troop meeting, our council required several different training sessions (Intro to Girl Scouting, Leadership Essentials, Grade-level basics, First Aid/CPR and Child Abuse Awareness). The council also wants a leader to attend a meeting for leaders each month, held in the evening.
I got one of my friends (whose daughter is friends with my daughter) to be a troop leader with me, so we split the duties half and half. That has worked pretty well.
Our group meets at in a classroom at the elementary school right after school, for about 1.5 hours. Because most of the mothers either do not work, or have flexible work schedules, we have been able to have a parent attend each meeting to assist the leader.
We also had to set up a bank account. Cookies sales took the leaders another several hours to organize and distribute (and our pick-up time was early on a Saturday morning

). Then you need to plan meetings, buy supplies, and keep parents informed of what is planned.
Planning the meetings is somewhat time-consuming. We are fortunate that the families in our troop are financially able to contribute towards troop expenses, because the crafts and other activities add up quickly (cookie dough is a help towards defraying this, but then you need time to staff booth sales or have parents willing to help their girls sell lots of cookies).
We were careful about which girls we gave information to about our troop formation. This sounds evil, I know, but it has been very helpful in an otherwise potentially stress-filled volunteer position to have girls who get along and parents who are supportive.
An acquaintance of mine found a high school student who was willing to come aboard her troop as an assistant leader. She attends all the meetings and the girls love her. I imagine she is interested in a teaching field, and the volunteer work will look good on her college applications. Might be something to consider if you decide to take the plunge.
It really is a lot of work, much more than I imagined. Part of me advises you: "Don't even think about it!" But the other part is a firm believer in the adage that if you want something done, you should ask a busy person. Does your job give you time to email or plot out a meeting schedule? Do you have other children you will need childcare for?
Good luck with making a decision!