[Wavytone]

At the levels of drift you are talking about, you will start to notice the effects of atmospheric refraction, which mostly amounts to an error in RA rate for objects east/west, and produces an offset in declination for objects north/south. It can amount to 15 minutes of arc low down. You will also run into errors arising from the angles between the RA, dec, and optical axes of the scope not being perfect right-angles, and there will also be errors due to the varying flexure of your mount and tube assembly as it moves across the sky, which may easily amount to much more than 15' and having a scope which you assemble/disassemble each night means any calibration you make must be repeated each night, if you are to have any chance of correcting these.

Then there are the errors in your gear train, for which periodic gear correction is OK short term (minutes) but not longer term if your mount has only a small worm wheel with relatively few teeth

Correcting for all of the above to achieve accurate blind pointing better than 15' is well beyond the capabilities of most small scopes - Meade's LX200 achieves 6'.