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Can anyone suggest what might the longest lettergroups — sequences of connected letters -- in Arabic? I'm looking for test cases and to determine maximum context length for some OpenType lookups.

If anyone has similar information for Persian and Urdu, what would also be appreciated.

I don't know whether this is the longest one or not...

فسيكفيكهم

فسنستفتيكموها
or just
فسنستفتيكمو
if you want right-joining connections too, أوفليستأمنوننكموهالهن should be the longest word.

The kind folk on the Persian Computing mailing list came up with some great examples in use in a variety of languages:

Arabic:
ليستخلفنهم ‎(Perhaps the longest such sequence in the Koran. From 24:55.)
الفلسطينيين (The Palestinians)
القسطنطينية (Constantinople)

Persian (Farsi):
منمشتعلعشقعلیمچهکنم (a famous conjoined version of the phrase من مشتعل عشق علیم چه کنم which nastaliq calligraphers write in this way to display their virtuosity)
مستضعفینی
فیلیپینیها (Filipinos)

Urdu:
اسپیسیفیکیشنز (specifications)
کمپیٹیبیلیٹی (compatibility)

Uighur:
بىسىمئىشلىتىشىدە
يىغىننىڭيېپىلىش

Azeri:
آلتمیشینجیسی (sixtieth)

Smiles is the longest word in English. Right?!
So, the longest word in Arabic should be Zamilay = Female Companion?!
زمیلــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــه
More:
فاسقیناکموه
انلزمکموها
Just copy and paste them in the search box and see
their translations + transliterations at Tanzil.info
with Flowers

Azeri/Ottoman with one more syllable آلتمیشینجیسینی / آلتمیشینجیسیكی altmışıncısını (his/her/its sixtieth - definite accusative).

In case you need a Latin equvalent, here's the longest Turkish phrase ever attested:

Avrupalılaştırılmıyanlardanmısınız? "Are you one of those people who oppose the adoption of European manners?"