Limit On Number of Fields to Calculate?

Is there a limit on the number of fields that can be calculated? I have a long list of fields (sub-totals, working fine) to total up (adding up those subtotals isn’t working).

Here is the formula (not working):
basic_sub-total+elk_quartered_sub-total+elk_sub-total+large_exotic_sub-total+caping_sub-total+gutting_sub-total+trimmings_sub-total+bacon_backstrap_sub+burger_with_brisket_sub+burger_with_bacon_sub+sliced_fresh_jerky_sub+marinated_fajita_sub+pan_sausage_sub-total+fresh_link_sausage_sub-total+jal_chz_link_saus_sub-total+fresh_link_pepper_jack_sub-total+fresh_link_sweet_chipotle_sub-total+fresh_link_sweet_chipotle_wch_sub-total+smoke_link_sub-total+jal_chz_smoke_link_sub-total+smoke_link_pepper_jack_sub-total+smoke_link_sweet_chipotle_sub-total+smoke_link_sweet_chipotle_wchz_sub-total+plain_summer_sausage_sub_total+jal_chz_summer_sausage_sub_total+snack_stix_sub-total+little_smokies_sub-total+jerky_sub-total