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A hearing on a motion for temporary orders can sometimes last all day. Be prepared for that. If you have kids that get out of school during the day, make arrangements beforehand to have a backup plan in case you do get stuck at court longer. A lot of times, cellphones aren't allowed in the courthouse. If you are going to have to make phone calls during the day, write down the numbers and bring them in with you. You can potentially use your attorney's cellphone in case of an emergency.
Lastly, keep your emotions in check. You will be tired at the end of the day, so plan to have an easy night. Relax, go exercise, or do something that will make you feel better and take your mind off everything you just went through.