Time series collection without TTL index not working properly

Working with Data
,
1

I have created a time series collection using
db.createCollection(“example101”, {timeseries: {timeField: “Emp_id”}, expireAfterSeconds: 300})

I had inserted data using
db.example101.insertOne({“Emp_id”:10, “Name”:“Shanmugham”})

I have not used any TTL index
I have seen that the data does not get deleted after 5 minutes but gets deleted after 3+ hours. I am using MongoDB compass to check this. Can anyone explain why mongod is not deleting the document in 5 mintes (300 secs)