Commitment is no doubt one of the qualifying requirements.
Most Lodges meet four, or five times per year. For example look at the Directory of Lodges here to give you some idea.
Lodges meet at various times from Monday to Saturday. There will be a Lodge near you that fits in with you current lifestyle and commitments.
In addition, most lodges will meet at least once per week for a couple of hours to rehearse for the next meeting.
This might be for the purpose of bringing in a new candidate, progressing a Brother to another degree or installing the new Master.
You are asked to attend meetings and Lodge of Instruction as much as you can without detriment to your current commitments.
A Freemason will always tell you family first, then work, then Freemasonry!