5 days is definitely time consuming and 15 leves is a lot for crafting considering 1 leve allowance is a ~70k or ~95k with no HQs depending on if you're doing the 35 or 40 linen triple leves. That's over a million xp from the guildleves. I farmed 1000 flax and did 11 leves too and coupled with the quests it also took me to 47. Everything from around level 36 until I started turning in the guildleves was definitely extremely time consuming compared to when I was actually crafting stuff around my level.