The length of prayers is not in anyway proportional to the depth of growth. One can pray 4 hours and be praying amiss the whole time. The length of your prayers does not impress God if it isn’t coming from a sincere heart.
God is more interested in who we are becoming rather than what we are doing.
When we view prayer as conversations, genuine conversations, we begin to gradually slip from the activity mode and step into the communion mode. You miss God and you want to talk to him. You want to involve him in every aspect of your life.
Prayer becomes something you look forward to.