Final answer:
Mama is concerned that Walter's frequent absence from home may indicate neglect of his familial duties or an attempt to escape from family life challenges.
Step-by-step explanation:
Mama's concern about Walter's frequent times away from home relates to the fear that Walter is not fulfilling his responsibilities and perhaps escaping from the challenges of family life. The excerpts provided do not directly address Walter's situation, but similar themes of escapism and parental concern are present in the context of advanced technology disrupting family dynamics and the nurturing environment. For example, in one of the excerpts, George Hadley considers turning off their high-tech house to rediscover a 'happy family existence,' which points towards a concern similar to Mama's about Walter—a desire for a more engaged and less escapism-focused family member.