import re
ss = ['A 9 minutes delay experienced','a 10 minutes delay']
for s in ss:
m = re.search(r'(\d{1,2})\s?(?:min|m|hour|hr?|minutes?)', s)
if m:
print(m.group(1))
aW1wb3J0IHJlCnNzID0gWydBIDkgbWludXRlcyBkZWxheSBleHBlcmllbmNlZCcsJ2EgMTAgbWludXRlcyBkZWxheSddCmZvciBzIGluIHNzOgoJbSA9IHJlLnNlYXJjaChyJyhcZHsxLDJ9KVxzPyg/Om1pbnxtfGhvdXJ8aHI/fG1pbnV0ZXM/KScsIHMpCglpZiBtOgoJCXByaW50KG0uZ3JvdXAoMSkp