I presume you mean bag drop? Remember Ryanair charge €/£55 to check in at the airport and €/£20 to print a boarding pass. Do ensure you check in online at least 2 hours before departure to avoid those fees. You can check in online (and print your boarding pass) up to 60 days before departure.

You don’t tell us what time your flight is. The bag drop/check in desks at MAN are open almost throughout the day. They are very busy first thing in the morning and again early afternoon and evening. Provided the desks are open you will normally be able to drop your bag(s) earlier than 2 hours. Bear in mind Manchester Airport will not normally allow you to pass through security more than 3 hours before your scheduled departure time.