I guess it depends on how one defines “honeymoon”. This will be different for everyone. For me, I think of the honeymoon period as a the time when eating very, very little calories took very minimal effort (again how one defines “effort” will vary from person to person).
Based on my own personal definition, my honeymoon probably lasted about 15 months.
These days (1 yr, 10mnths), I have to be much more mindful of what I’m eating & burning off, cuz if I dont pay attention I’ll likely gain weight.