You can use terminationGracePeriodSeconds

From docs (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.19/#podspec-v1-core):

terminationGracePeriodSeconds

integer Optional duration in seconds the pod needs to terminate gracefully. May be decreased in delete request. Value must be non-negative integer. The value zero indicates delete immediately. If this value is nil, the default grace period will be used instead. The grace period is the duration in seconds after the processes running in the pod are sent a termination signal and the time when the processes are forcibly halted with a kill signal. Set this value longer than the expected cleanup time for your process. Defaults to 30 seconds.

Here is an example:

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: test
  name: test
spec:
  replicas: 1
  selector:
    matchLabels:
      app: test
  strategy: {}
  template:
    metadata:
      labels:
        app: test
    spec:
      containers:
      - image: test
        name: test
      terminationGracePeriodSeconds: 60  # <----HERE

Additionally you may also want to check the docs about container lifecycle hooks.