At the validation stage, models with few or no hyperparameters are straightforward to validate and tune. Thus, a relatively small dataset should suffice.
In contrast, models with multiple hyperparameters require enough data to validate likely inputs. CV might be helpful in these cases, too. Generally, apportioning 80 percent of the records to train, 10 percent to validate, and 10 percent to test scenarios ought to be a reasonable initial split.