superstars27

Not sure how many chapters is "a lot" but here's a list with manga containing 10+ chapters:
http://www.mangago.me/home/mangalist/3276/

Sorry if it's not what you're looking for ;;

Skip Beat (220~ + chapters)
Tokyo Crazy Paradise (same author as above, 110 chapters. Kinda intense o.o)
Seiyuu Ka~ (~60 chapters)
Hana to Akuma (58 chapters)
Love so Life (~90+ chapters)
Special A (90 chapters)
Kitchen no Ohimesama (47 chapters)
Ultra Maniac (25 chapters)
My personal recommendations. Sorry I can't provide you with links (〜￣△￣)〜 but they're all on this website :)

The one :))

http://m.mangafox.me/manga/the_one/v01/c001/1.html

http://www.mangago.me/read-manga/kanata_kara/
http://www.mangago.me/read-manga/honey_x_honey_drops/
http://www.mangago.me/read-manga/anatolia_story/
http://www.mangago.me/read-manga/h3_happy_hustle_high/
http://www.mangago.me/read-manga/hanayomesama_wa_16_sai/
http://www.mangago.me/read-manga/heart/
http://www.mangago.me/read-manga/he_s_dedicated_to_roses/
http://www.mangago.me/read-manga/akkan_baby/
http://www.mangago.me/read-manga/aaa/
http://www.mangago.me/read-manga/shinshi_doumei_cross/
http://www.mangago.me/read-manga/kiken_junai_d_n_a/
http://www.mangago.me/read-manga/otona_ni_nuts/
http://www.mangago.me/read-manga/angel_diary/
http://www.mangago.me/read-manga/princess_ai/

Only shoujo? Not josei? Ooohh...there are so many!!
-Skip Beat!
-Kaichou wa Maid-sama
-Wild Ones
-Desire Climax
-Takane to Hana
-Moe Kare
-Lovely Complex
-Hana to Namae
-Kyou, Koi Wo Hajimemasu
-Haou Airen
-Kimi ni Todoke
-Faster than a kiss
-Hadashi de Bara wo Fume
-Black Bird
-Hana to Akuma
-Love so Life
-True Love
-Dengeki Daisy
-P to JK
-Oresama teacher (if you don't mind comedy)
-Kobato
-Hirunaka no Ryuusei
-Taiyou no Ie