code: def _for_duration(field):
      # SQLite stores timedeltas as six bytes of microseconds
      if using_sqlite():
          delta = timedelta(microseconds=2**47 - 1)
          return st.timedeltas(-delta, delta)
      return st.timedeltas()
  
imports: from __future__ import absolute_import, division, print_function
  import re
  import string
  from datetime import timedelta
  from decimal import Decimal
  import django
  import django.db.models
  import django.forms
  from django.core.validators import validate_ipv4_address, validate_ipv6_address, validate_ipv46_address
  import hypothesis.strategies
  from hypothesis.errors import InvalidArgument
  from hypothesis.extra.pytz import timezones
  from hypothesis.internal.validation import check_type
  from hypothesis.provisional import ip4_addr_strings, ip6_addr_strings, urls
  from hypothesis.strategies import emails
label_desc: Use image node_id 6 for calling a global function with example usage: _for_duration(field) and returns: st, st