Like any decorator, you can use timeout with the @timeout(secs) syntax or manually pass in a function to wrap

Using Timeout Decorator.py

from twisted.internet import defer, reactor

@defer.inlineCallbacks
def main():
    client = Client()
    foo_with_timeout = timeout(5)(client.foo)
    try:
        result = yield foo_with_timeout(x=1, y=2)
    finally:
        reactor.stop()
    
    print result
    
main()
reactor.run()