Hi Samuel,
In the most recent AdWords API versions, instead of letting users wait for significantly long periods for processing excessive number of requests, it will just fail the request as discussed
here and this should prompt the user to further breakdown their requests.
Additionally, depending on which service you are using, there may apply conditions on the allowable size or number of objects you can pass on a single request or other limits applicable to various objects. For additional reference, you may take a look at the rest of our
rate limits guide, the
system limits, and our
rate sheet for more information regarding the limits associated to the usage of the AdWords API.
I hope this has been helpful and feel free to write back if you have any further questions.
Thanks and regards,
Peter
AdWords API Team