What are your rules with screen time/devices in young teens

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I have a 14 nearly fifteen year old daughter and am worried she is using her ipad way too much. I try to set limits and use the screen time, but I'm not sure if I'm being strict enough! I would be really interested to hear what other parent rules are with regards to screen time and looking at their devices. Also any tips to try and get them off and do something more active would be great!

Very difficult at the moment because they've been virtually welded to their screens for large chunks of the past year for school work and contact with friends.
My rules are to explain the consequences of various actions, allow them to self- limit use, and accept they live in a different world ( and recently extremely challenging times) to the one I grew up in.