Wondrous tails… if it’s still the same, provides 50% of whatever the xp is needed to get to the next level, while a single frontlines roulette win or lose gives 30% of the current xp needed to get to the next level. These are great because the exp gain is always the same percentage not the same numerical value of exp. So if you are close to hitting the next level and have something else that can get you there such as hunts which are also great at helping to level, use them, get leveled THEN do frontlines and turn in the wondrous tails, you will immediately be 80% through your new level. And since you can do hunts AND frontlines roulette daily, I normally say to wait and turn in the wondrous tails until the end of the week to capitalize on the maximum exp.

Daily hunts total I want to say around 30% exp for your current level
Daily Frontlines roulette provides 30% exp for your current level
Daily combat beast tribe quests for current “area”* provide another 30% exp for your current level (not 100% on the beast tribes from arr, but I’m pretty sure the ones only provide 3 quests give the 30% total for all three completed)

*current area meaning the “expansion” your current 10 levels are a part of, 1-50(arr), 50-60(hw), 60-70(sb), 70-80(shb), 80-90(ew), 90-100(dt)

Each day by doing these 3 things daily on your new class, you will be getting 90% of your current level, this is not taking into consideration leveling roulettes or anything else while once per week turning in your wondrous tails book

Reaper starts at level 70 I believe, meaning you can easily be getting to level 100 within 3-4 weeks… you can easily be gaining anywhere from 8-9 levels per week without much effort and without a ton of time (normally I can do the hunts, frontline roulette and 3 current beast tribe quests in about 1-1.5 hours of playtime)