I had my first lesson in five months today because I've been so busy with work.
This is the first lesson I've had in over five months because things have been really hectic for me at work.
ーI had my first lesson in five months today because I've been so busy with work.
「仕事が忙しくて、今日は5ヶ月ぶりにレッスンを受けた」
to have my first lesson in five months で「5ヶ月ぶりにレッスンを受ける」
ーThis is the first lesson I've had in over five months because things have been really hectic for me at work.
「仕事がすごく忙しくて5ヶ月ぶりにレッスンを受けた」
This is the first lesson I've had in over five months で「5ヶ月ぶりにレッスンを受けた」とも言えます。
ご参考まで！
カナダ 
