After delegating your GRT tokens in The Graph network, you can typically expect to start seeing rewards within one to two epochs. Each epoch in The Graph’s system generally lasts around 28 days. Therefore, you may begin to notice accrued rewards after approximately 28 days, but the actual time frame can vary depending on the performance of the indexer you delegated to and the overall network conditions. Keep in mind that while rewards accumulate, you will need to actively claim them through the network interface at the end of each epoch to access your earnings.