Depending on the destination in Singapore.

Tuas to city center can take half an hour to one hour during peak periods. If the destination is western Singapore, get a bus that allows early alighting, and switch to a CausewayLink city bus at Tuas CIQ. Tuas to Boon Lay is ten minutes. No severe congestion expected. Congestion usually starts somewhere before Jurong Town Hall Road exit.
Tanjung Kupang to Tuas is affected by truck traffic, and occasionally bus traffic, at Tuas CIQ. Worst case in recent years is additional half an hour delay. Longest in history may be one hour.
Immigration clearance for tourists may add another half an hour.
TBS to Tanjung Kupang is usually affected by the congestion in KL and Selangor, also Negeri Sembilan, which can add another half an hour.

Without congestion, should be minimum 4.5 hours, unless the driver speeds. I would expect 5.5 hours as the norm.

This post has been edited by hwt: Aug 29 2014, 05:17 PM

Separate. There is no way to enter the railway station after leaving the bus passenger departure hall. Railway immigration counters are beside the railway track at the ground floor or a basement level. Bus immigration counters are upstairs. Similar to Tanjung Puteri.

This post has been edited by hwt: Aug 29 2014, 08:23 PM

Soon, they are going to add a stop at GP Prima. The station has just started operation. So, be ready to add about 15 or 20 minutes to the overall journey time for most of the companies.



This post has been edited by hwt: Aug 29 2014, 11:40 PM