Duration isnt set correctly

[Payback159]

Reproducable with

curl -X 'POST' \
'https://tenama/namespace' \
-H 'accept: application/json' \
-H 'Content-Type: application/json' \
-d '{
"duration": "60",
"infix": "test",
"suffix": "111",
"users": "test.test@test.com"
}'