No. The 18 minute limit applies only in the same station. You can use the card in any other station as soon as you are able to get there.
The most common related problem encountered by tourists is getting in on the wrong side of a station where you can’t cross from one side to the other without leaving the station. Then they are at the mercy of the station agent’s kindness to let them through the service gate.
I’m not sure how it works on the bus if you want to get back on the same line after doing a quick errand, but certainly if you’re transferring to a different line you will have no problem.
Source: personal experience.
For Unlimited metrocards, you do not have to wait to transfer from one line to another and you do not get charged – it gives you unlimited rides. 18 minute rule does not apply unless you’re using the metrocard in the same station or on the same bus line (even if you are getting on a different bus – I once missed my stop, so I just decided to get on another bus going in the opposite direction, but my metrocard didn’t work, showing that it was “Just used”).
For Pay Per Ride metrocards, you can transfer once for free within 2 hours of the initial swipe in the following cases: Bus to Train, Train to Bus, Bus to Bus (different lines, see my experience above), and Train to Train (more on this below). You insert/swipe the card the 2nd time anyway, but it doesn’t get charged.
For Train-Train transfers you can either:
Credit:stackoverflow.com‘
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