Hi Rishi,
There won't be any issue if time evaluation is done on a weekly basis after manual upload of time events.
Only thing will be is that the time evaluation results will get delayed since the data is coming one week late.
Apart from that, I don't see any issue.
Uploading of data will trigger retro time evaluation from the date the data has changed/created.
All reports will display data only till the period time evaluation has run.
Thanks and regards,
Vivek Barnwal