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Origin -destination matrix in QGIS

I’m trying to calculate time taken to nearest hospital, from population centroids with OD Matrix in QGIS. I actually want to calculate walk-time, so I set the default speed to 5km/h. The total cost I’m getting is very high, is their something wrong with my parameters or is OD only for drive-time and drive-speed, so a higher speed value? Also what is the difference between entry cost, exit cost and network cost and total cost?