I have two best friends since childhood (ISFJ and INTJ). We don't live close to each other anymore, but we do our best to meet once every season. It's always comfortable when we meet. The ISFJ lives closer, and our birthday is around the same date, so we often have lunch together to celebrate. I also had a SFP best friend growing up (she was part of this group), but she moved on with her life and isn't in touch anymore, even if the ISFJ and myself tried to keep it going.
I have a close ENFP friend and colleague right now (it's been going for around 3 years); we see each other regularly enough and have deep conversations.

Another colleague is INFP and we share books, movies and occasionally see each other outside of work.
I have plenty of church friends and I have a deep bond with them, seeing them as brothers and sisters, but I would say my pastor (INTP) is the closest. Conversations are great and we are always available to help each other out. He once said to me that what he liked about our friendship is that we don't need to reassure each other about it. We are friends, period.
My ENTP uncle and ISFJ aunt (his wife) are and have always been very dear to me, and we see each other at least once a week. They are always available to help or encourage me when I need it.
Those are the people I consider "close." I have plenty of other good acquaintances and help them readily when they need it, but I don't think we are
close. Then again, life is a fluid thing, and the list can change with time, especially in the workplace.
I remember hearing this in a Christian broadcast once: "God sometimes gives friends for a season, and others for a lifetime." It can be hard to let go of someone for me, so I am learning to set a healthy distance in my friendships.