Pending results occur because they had insufficient information to determine your grade. Hence there are a large variety of reasons which could cause a pending result.
Possible reasons could include technical issues with the exam script that was submitted (they struggle to open it at their end), special circumstances which needs to be investigated further (more complex cases), academic conduct issues (plagiarism in the remote exam/EMA/TMAs) etc.
The time it will take to get a grade will vary depending on the reason. A technical issue could be resolved quickly. Whereas an academic conduct investigation can take time. Also staff could have some annual leave over the summer so that could potentially delay things further.