Basically, you can request a revision anytime as long as your order is active and not handed in. Still, it is much more reasonable to send your paper for revision within 48 hours or 30 days (depending on the specifics of your order), as this timeframe is free of charge. Late revision requests should be compensated. Besides, the revision option can be found on your profile where “Completed orders” are located. Revising should also be based on specific instructions, as the writer should know which parts to improve.