On the 15th year (that of his 35th birthday) Rashid puts the magical skills he has cultivated to the test, and spends his 3 free seasons on lab activities (thus, no xp according to the rules). I assume that his House of Wisdom allows him the use of a "normal" laboratory (push come to shove, now that he's wealthy he could hire someone to do it). On his first season, he creates a Khadim bond with Aisha. On his second and third season, he creates a dose of Al-Iksir with Aisha's help (he creates the Khadim bond first, because Al-Iksir will reduce Aisha's Might and thus the bond's power).
Let's look at the details. In theory, on any season Rashid has a taqa allowance equal to half of the maximum taqa he could spend on the activity. I find it a somewhat whimsical rule but... I'll assume that, for purposes of computing the maximum taqa, one adds the maximum taqa that could be spent on the initial summoning, plus that to be spent on the seasonal activity proper. So, when dealing with Aesha, the maximum is 16 taqa for the summoning (Sihr 16), plus 5 (Aesha's Might of 25, divided by 5). This gives a seasonal allowance of 21/2=11 taqa.
To create the khadim bond, Rashid spends 6 taqa on the Summoning (so he can spend 5 on the bond).
He rolls 3, +16 (Sihr), +1 (Presence), +12 (6 taqa) = 32. He adds a confidence point, bringing the total to 35, for a summoning strength of 10. His lab total is 10 (summoning strength) + 2(Intelligence) + 12 (Alchemy) + 1 (Magic Lore) = 25, and he just manages the necessary total. Since Aisha will be his primary helper, Rashid creates a balanced bond, putting 1 point each in Casting, Finesse, Penetration, Safety, and Concentration.
Next season, Rashid focuses on Al-Iksir. Again, he spends 6 taqa on the Summoning.
He rolls a 1 followed by a 4, yielding an 8, +16 (Sihr), +1 (Presence), +12 (6 taqa) = 37, for a summoning strength of +12. This would yield a lab total of 12 (summoning strength) + 2(Intelligence) + 12 (Alchemy) + 1 (Medicine) = 27, but Aesha's Might caps this at 25. Rashid then gets 5 Al-Iksir points. He reduces his age by 10 years, and loses 5 dice of xp. He rolls 1,5,9,2,6, for a total of 23xp. I'll assume he loses them from the skills he gained earliest ("starting from childhood"), so I'll take off 15xp of Speak Arabic, and 5xp of Area Lore, and 3xp of Charm.
Next season, Rashid repeats the process. However, Aisha's Might is now 20. This will cap Rashid's lab total to 20, and reduces his taqa allowance to 10=(16+20/5)/2. Rashid spends 6 taqa on the Summoning.
He rolls a 5, +16 (Sihr), +1 (Presence), +12 (6 taqa) = 34, for a summoning strength of +14. This would yield a lab total of 14 (summoning strength) + 2(Intelligence) + 12 (Alchemy) + 1 (Medicine) = 29, but Aesha's Might now caps this to 20. Rashid then gets 4 Al-Iksir points. He reduces his age by 8 more years, and loses 4 dice of xp. He rolls 3,5,8,9, for a total of 25xp. I'll take off 20 more of Speak Arabic and 5 of Awareness.
At the end of the year, Rashid has lost many of his childhood memories, and has lost 48xp, seeing his Speak Arabic drop from 5 to 3(10), his Charm from 1 to 0(2), his Area Lore from 2 to 1(5), his Awareness from 1 to 0. His age is now 35-10-8=17, and he makes his first aging roll. I'll assume Rashid lives in an environment with no bonus or penalty (or perhaps he lives in a typical town, with a -2 penalty, but he can afford medical care and a regimen yielding a +2 bonus). He gains a +5 bonus to his aging rolls due to his being wealthy (+2) and having an Alchemy score of 12 (+12/5=+3). He rolls 7, +2 (17/10 age modifier), -5 (aging bonus), yielding a 4 (no adverse effects).
The last 5 years of this 20-year interval on the next post!