Personally, I replaced my time measurement with 'moments' instead of seconds. There isn't really a minute measurement in my world, so I paced time by how many footsteps that people took until they reached a place.
Since there is a Christian presence in your world, have the local church tower call the hour for mass. That way, the faithful count time by when the service starts and end working in the fields when the bells chime at sunset for evening prayer. The bells would act as a reliable clock for people to time their lives and meals.
Another thing is the placement of the sun. High noon, afternoon, sunrise, sunset, dusk, evening. Time used to be easy to keep track of back then. Ex: The cooks would fire the ovens and bake the day's bread. People wake at sunrise or when they smell the cooking. Stomachs rank the passing of time, indicating when the character needs to be fed.
"I'll meet you at the stables after the evening bells ring"
"Be ready to mount up and ride at dusk"
"I'll be ready to meet after the morning bread is done."
Does this help?