السلام عليكم و رحمة الله و بركاته، I think the best sentence for you is : في هذه الأيام، ليس عندي فرصة للإسترخاء. أمّا في عطلة نهاية الأسبوع فأصبحت أكثر إنشغالاً من الأسبوع كلّه. We add أمّا it's an explanation particle حرف تفصيل And for avoiding repetition and long sentence with الحروف و أدوات الربط as well. And الفاء it's necessary to add it because after Faa الفاء there is an answer. for example : أمّا صُهيبٌ فَمجتهدٌ About اليومين two days it's not necessary to explain your sentence because most the countries have 2 days of rest and worship which is weekend. And the day of worship depends on the religion of the country. I wish you a pleasant journey with Arabic :)

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Mostly good! Don't forget punctuations.

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