shutdown command fails on single node replica set for timeoutSecs >= 120

$ mongo  --eval 'db.setLogLevel(1, "replication");db.getSiblingDB("admin").shutdownServer({"force": true, "timeoutSecs": 121})' ; echo "status = $?"

MongoDB shell version v3.7.0-472-g11225541cb

connecting to: mongodb://127.0.0.1:27017

MongoDB server version: 3.7.0-472-g11225541cb

2018-01-12T16:32:52.267+0000 E QUERY    [thread1] Error: shutdownServer failed: {

        "ok" : 0,

        "errmsg" : "By the time we were ready to step down, we were already past the time we were supposed to step down until",

        "code" : 50,

        "codeName" : "ExceededTimeLimit",

        "operationTime" : Timestamp(1515774634, 5),

        "$clusterTime" : {

                "clusterTime" : Timestamp(1515774634, 5),

                "signature" : {

                        "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),

                        "keyId" : NumberLong(0)

                }

        }

} :

_getErrorWithCode@src/mongo/shell/utils.js:25:13

DB.prototype.shutdownServer@src/mongo/shell/db.js:453:1

@(shell eval):1:34

status = 252

$ mongo  --eval 'db.setLogLevel(1, "replication");db.getSiblingDB("admin").shutdownServer({"force": true, "timeoutSecs": 119})' ; echo "status = $?"

MongoDB shell version v3.7.0-472-g11225541cb

connecting to: mongodb://127.0.0.1:27017

MongoDB server version: 3.7.0-472-g11225541cb

server should be down...

status = 0