It sounds like there are some very positive signs in your relationship! Talking for 3-4 hours daily shows there's a strong connection and plenty of communication between you two. That's a wonderful foundation for any relationship. Here are a few things to consider:

1. **Consistency**: Has this daily communication been consistent over a significant period of time? Consistency helps build trust and shows sincerity.

2. **Deeper Conversations**: Are your conversations meaningful? Do you both discuss your thoughts, feelings, and future plans? Deep, honest conversations are a great indicator of a healthy relationship.

3. **Actions Align with Words**: Do her actions align with her words? Actions often speak louder than words, so it's important that her behavior matches what she's saying.

4. **Mutual Effort**: Trust is built on mutual effort. Are both of you putting in the effort to maintain and grow your relationship?

5. **Past Experiences**: Consider your past experiences and instincts. Have you noticed any red flags or felt uneasy about anything specific? Trusting your gut feeling is important.

6. **Future Plans**: If she's talking about marriage, see if you both have similar goals and visions for the future. It's crucial to align on important aspects like values, career goals, children, etc.

Remember, trust is a crucial part of any relationship, but it’s also something that is earned over time. If things feel right and you’re both committed to making the relationship work, then this could be a wonderful step forward. Trust your instincts and communicate openly with her about any concerns or questions you have—open dialogue is key to building a strong, trusting bond.