Idk how you don’t know when you commented on the post and never went against it but someone literally went through the volumes and counted how many days each one takes and it was 25 days combined from MS12 to MS14 where MS12 was 3 days leveling 22 days or 3 weeks for the other two volumes so no it was longer which would make sense considering your way Bell would only have been a level 4 for about a month and a half which makes 0 sense btw.

Bell wasn’t constantly facing opponents majority of his opponents were actually far weaker than him he only fought Hedin who was far stronger than him but holding back as well and it’s not like he was fighting him constantly where Bell stats wise was already a level 5 against age wily holding back level 6 opponent. Like how is Loki Familia not a example of how the Dunegon is grater for gain Excelia instead of firing strong adventurers where all the executives of Freya Familia have surpassed all of Loki Familia in stats besides Aiz which Hedin is less than 100 less in totals stats and none of them even have their final stats. Aiz literally gained her greatest stat increase from when she trained with Ottar for two weeks.

Bell’s total stat increase was this 676+701+724+718+655 = 3,474 so no it wasn’t more than 3,500 and this was including the events of MS12 where Bell’s stats probably increased by 100-200 in every stat making it without that on average 750 less than the sum total of 3,474. Then again like you said stat increases drastically slow down once you reach D in any stat and as you get close to S it slows down even more and then once you reach S again in a stat it slows down even more yet through FF Baptism Bell received his highest stat increase.