JS wrote:
Cross-country glider flights in which you landed more than 50NM from
where you took off also count towards the single engine requirements.
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Negative, JS. See 61.109(a)(5)(i):
"10 hours of solo flight time in a single-engine airplane, consisting
of at least--
[i] 5 hours of solo cross country time."

Your glider cross countries can count towards commercial or ATP, but
not private. Look to the requirements of each certificate and apply.
I do not know how any DPE could verify that the farmer's field you
landed in was at least 50 NM from your departure for commercial or
instrument. Good luck with that.

Terry C