How long does 1-99 Slayer take in RuneScape?

Hello, I will be starting slayer in a while, just wanted to know how long it will take from 1 to 99 Slayer, thanks
Update: Say I had 90 Strength/ATK/DEF/HP, 80 Mag, 76 Range, done all quests, 80 Agility/99 Thieving, 75pray, 80 Summoning, 70 Hunter
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